PICTURE EXCLUSIVE: Under wraps! 'Pregnant' Khloe Kardashian hides her stomach with a blanket as she arrives in San Francisco with Kim and Kourtney

By Sarah Sotoodeh For Dailymail.com

Published: 12:58 EDT, 14 October 2017 | Updated: 17:17 EDT, 14 October 2017

She is rumored to be pregnant with her first child.

But on Friday ,Khloe Kardashian covered up her stomach with a blanket as she arrived to San Francisco with her sisters Kim and Kourtney Kardashian.

The 33-year-old star and her siblings were spotted heading out of a private jet upon arrival to the Northern California city.

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Low key: Khloe Kardashian covered up her stomach with a blanket as she arrived to San Francisco with her sisters Kim and Kourtney Kardashian on Friday

Low key: Khloe Kardashian covered up her stomach with a blanket as she arrived to San Francisco with her sisters Kim and Kourtney Kardashian on Friday

Khloe, who is reportedly 'three months pregnant' according to TMZ, cut a casual figure in her black jacket.

The star opted to hold a blanket over her stomach area, covering up any clues to her 'pregnancy.' 

Khloe pulled her blonde locks back into a casual bun, adding large framed sunglasses with no makeup. 

TMZ reported that Khloe is expecting her first child with her boyfriend of one year, NBA star Tristan Thompson, 26. 

The 33-year-old star and her siblings were spotted heading out of a private jet upon arrival to the Northern California city; Kim pictured leaving the jet

The 33-year-old star and her siblings were spotted heading out of a private jet upon arrival to the Northern California city; Kim pictured leaving the jet

Wow: Kourtney slipped on silky blush and black pajamas-inspired clothing for her head turning arrival

Wow: Kourtney slipped on silky blush and black pajamas-inspired clothing for her head turning arrival

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Meanwhile Kim looked incredible in her figure flattering ensemble. 

The mother of two flaunted her flat stomach in a skintight charcoal turtleneck, adding black biker shorts with matching knee-high boots.

Kim, 36, carried her large black Hermes Birkin bag as she exited the jet.

She styled her platinum dyed in waves, center parted and loose; she sported nude lips and a touch of eye shadow on her lids.

Shy: The star opted to hold a blanket over her stomach area, covering up any clues to her 'pregnancy;' Khloe pictured with Kourtney

Shy: The star opted to hold a blanket over her stomach area, covering up any clues to her 'pregnancy;' Khloe pictured with Kourtney

Staying close: Khloe pulled her blonde locks back into a casual bun, adding large framed sunglasses with no makeup; Khloe with Kourtney after touch down

Staying close: Khloe pulled her blonde locks back into a casual bun, adding large framed sunglasses with no makeup; Khloe with Kourtney after touch down

Hiding your 'baby bump'?: Khloe, who is reportedly 'three months pregnant' according to TMZ, cut a casual figure in her black jacket

Hiding your 'baby bump'?: Khloe, who is reportedly 'three months pregnant' according to TMZ, cut a casual figure in her black jacket

Stunning lady: Meanwhile Kim looked incredible in her figure flattering ensemble

Stunning lady: Meanwhile Kim looked incredible in her figure flattering ensemble

Kim recently confirmed she's expecting a third child with her husband Kanye West via surrogate in teaser clip she shared of Keeping Up With The Kardashians.

The beauty entrepreneur and the rapper, 40, are parents to two kids together: daughter North, four, and son Saint, who turns two in December.  

Kourtney slipped on silky blush and black pajamas-inspired clothing for her head turning arrival.    

The mother of three's trousers had a loose fit while the top featured a fabric belt. 

Perfection: The mother of two flaunted her flat stomach in a skintight charcoal turtleneck, adding black biker shorts with matching knee-high boots

Perfection: The mother of two flaunted her flat stomach in a skintight charcoal turtleneck, adding black biker shorts with matching knee-high boots

Amazing: The beauty entrepreneur and the rapper, 40, are parents to two kids together: daughter North, four, and son Saint, who turns two in December
Amazing: The beauty entrepreneur and the rapper, 40, are parents to two kids together: daughter North, four, and son Saint, who turns two in December

Amazing: The beauty entrepreneur and the rapper, 40, are parents to two kids together: daughter North, four, and son Saint, who turns two in December

She's so glamorous: Kim, 36, carried her large black Hermes Birkin bag as she exited the jet

She's so glamorous: Kim, 36, carried her large black Hermes Birkin bag as she exited the jet

Beaming: Kim recently confirmed she's expecting a third child with her husband Kanye West via surrogate in teaser clip she shared of Keeping Up With The Kardashians

Beaming: Kim recently confirmed she's expecting a third child with her husband Kanye West via surrogate in teaser clip she shared of Keeping Up With The Kardashians

Chic: The mother of three's trousers had a loose fit while the top featured a fabric belt

Chic: The mother of three's trousers had a loose fit while the top featured a fabric belt

The stunner pulled her dark locks back into a bun with shimmery eye makeup and contoured cheeks.

Although not with them on the trip, their younger sister Kylie Jenner is also reportedly pregnant. 

The 20-year-old is 'five months pregnant with a baby girl,' according to TMZ.

She has been in a relationship with rapper Travis  Scott, 25, since April. 

Kim posted a Snapchat on Friday revealing that she and Kourtney will be appearing on One Voice: Somos Live!, which is a benefit concert for Puerto Rico. 

She said that she will be answering phones with Kourtney at the Jennifer Lopez, Alex Rodriguez and Marc Anthony hosted event to raise money for disaster relief.

The telethon and concert special will be filmed both in Los Angeles and Miami; funds raised will go to various charities, including Feeding America, Unidos Por Puerto Rico, United Way, UNICEF, Save The Children and Habitat For Humanity. 

It is set to air on NBC on Saturday evening at 10/9 C. 

Fancy: The stunner pulled her dark locks back into a bun with shimmery eye makeup and contoured cheeks

Fancy: The stunner pulled her dark locks back into a bun with shimmery eye makeup and contoured cheeks

Denim diva: Kim was later spotted at her hotel rocking a different outfit

Denim diva: Kim was later spotted at her hotel rocking a different outfit

Still working: The star is filming scenes for Keeping Up With The Kardashians while in the Bay Area

Still working: The star is filming scenes for Keeping Up With The Kardashians while in the Bay Area

Big heart: Kim posted a Snapchat on Friday revealing that she and Kourtney will be appearing on One Voice Somos Live!, which is a benefit concert for Puerto Rico

Big heart: Kim posted a Snapchat on Friday revealing that she and Kourtney will be appearing on One Voice Somos Live!, which is a benefit concert for Puerto Rico

While in San Francisco, Khloe shared a Snapchat inside a San Francisco restaurant.

She was enjoying a meal with Kourtney and Kim when the alarm inside the building went off.

Khloe told her followers that the people inside the restaurant told her 'it was a test' although the alarm sounding told patrons to leave due to an emergency.

She used Snapchat filters on herself and her sisters as they appeared to wait it out with other customers.

Beaming: While in San Francisco, Khloe shared a Snapchat inside a San Francisco restaurant

Beaming: While in San Francisco, Khloe shared a Snapchat inside a San Francisco restaurant

Interrupting their meal: She was enjoying a meal with Kourtney and Kim when the alarm inside the building went off; Kourtney pictured

Interrupting their meal: She was enjoying a meal with Kourtney and Kim when the alarm inside the building went off; Kourtney pictured

Explaining the situation: Khloe told her followers that the people inside the restaurant told her 'it was a test' although the alarm sounding told patrons to leave due to an emergency

Explaining the situation: Khloe told her followers that the people inside the restaurant told her 'it was a test' although the alarm sounding told patrons to leave due to an emergency

Taking a minute: She used Snapchat filters on herself and her sisters as they appeared to wait it out with other customers; Kourtney pictured

Taking a minute: She used Snapchat filters on herself and her sisters as they appeared to wait it out with other customers; Kourtney pictured

Kim also posed for a quick selfie for her Instagram story.

The KKW Beauty founder also posted a snap of her Alexander Wang X Judith Leiber studded money band inspired clutch, which retails for $4,995; it has 10,263 Swarovski crystals.

Kim revealed in her stories she and her siblings took a private midnight tour of Alcatraz Island to see the abandoned prison. 

It served as a federal prison from 1934 to 1963; prior to that it was a military prison from as early as 1861 during the Civil War.

Al Capone served time at the penitentiary, as well as criminals Frank Morris, Robert Franklin Stroud and George 'Machine Gun' Kelly.

Incredible: Earlier in the day, Khloe shared a stunning view of the city

Incredible: Earlier in the day, Khloe shared a stunning view of the city

Always time for a photo: Kim also posed for a quick selfie showing off her stunning looks

Always time for a photo: Kim also posed for a quick selfie showing off her stunning looks

Eerie: Kim revealed in her stories she and her siblings took a private midnight tour of Alcatraz Island to see the abandoned prison

Eerie: Kim revealed in her stories she and her siblings took a private midnight tour of Alcatraz Island to see the abandoned prison

Here we go: Al Capone served time at the penitentiary, as well as criminals Frank Morris, Robert Franklin Stroud and George 'Machine Gun' Kelly.

Here we go: Al Capone served time at the penitentiary, as well as criminals Frank Morris, Robert Franklin Stroud and George 'Machine Gun' Kelly.

Views: It served as a federal prison from 1934 to 1963; prior to that it was a military prison from as early as 1861 during the Civil War

Views: It served as a federal prison from 1934 to 1963; prior to that it was a military prison from as early as 1861 during the Civil War

Impressive: as a snap of her Alexander Wang X Judith Leiber studded money band inspired clutch, which is worth $5,000

Impressive: as a snap of her Alexander Wang X Judith Leiber studded money band inspired clutch, which is worth $5,000

So sweet: On Saturday, Kim shared an adorable photo of herself with son Saint; she captioned it: 'Mommy & Son day today'

So sweet: On Saturday, Kim shared an adorable photo of herself with son Saint; she captioned it: 'Mommy & Son day today'

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