Jessica Simpson and her pregnant sister Ashlee make it a double date as they attend The Gleason Project special preview in LA 

Jessica and Ashlee Simpson brought along their respective husbands, but still managed to steal some sister time together at this event.

The blonde duo were a main attraction as they hit up a special preview of The Gleason Project at ZEFR Warehouse in Los Angeles on Thursday.

Jessica, 34, and Ashlee, 30, hugged for the cameras, which was a sight to see considering the latter's burgeoning baby bump.

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Double date: Jessica Simpson and her pregnant sister Ashlee stole some time together at The Gleason Project special preview in LA on Thursday - in spite of Eric Johnson's photobombing

Double date: Jessica Simpson and her pregnant sister Ashlee stole some time together at The Gleason Project special preview in LA on Thursday - in spite of Eric Johnson's photobombing

Sexy Jessica looked stunning in white-trimmed, black jumpsuit that showed off her slender waist and toned arms.

Ashlee, who is expecting a girl this summer, wore a flowing red dress with long black coat along with black high heels.

When she wasn't hanging out with Jessica, Ashlee was giving husband Evan Ross the loving treatment.

Having a swell time: Ashlee cradled her burgeoning baby bump while Jessica attempted a sexy pose at the exclusive party with their respective husbands 

Having a swell time: Ashlee cradled her burgeoning baby bump while Jessica attempted a sexy pose at the exclusive party with their respective husbands 

Get a jump on style in Jessica Simpson's Roland Mouret jumpsuit!

Jessica Simpson and her pregnant sister made a stylish pair as they attended the Gleason Project event with their husbands. The blond singers looked great as Ashlee rocked a long red dress and black cape over her ever growing bump, but it is Jessica's jumpsuit that we are obsessing about.

The black jumpsuit that boasts a white contrasting detail at the neck is the perfect thing to wear when you want to be the center of attention. The Roland Mouret jumpsuit has everything we are loving in a jumpsuit at the moment. Sleek fit, halter neck, and chic wide leg that you should pair with an amazing pair of heels.

Roland Mouret is a designer that A-Listers just can't get enough of. From Solange to Victoria Beckham-this brand is the way to go for style and glamour. To get Jessica's exact jumpsuit head on over to FWRD by clicking the link to your right. If you are like us and need budget friendly options, check out what we found from some of your favorite sites below!

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Isn't this fun: Jessica was all dressed up in a white-trimmed, black jumpsuit while Eric suited up nicely too

Isn't this fun: Jessica was all dressed up in a white-trimmed, black jumpsuit while Eric suited up nicely too

My guy: The cuddly Jessica gave her husband a big warm hug

My guy: The cuddly Jessica gave her husband a big warm hug

'It’s amazing,' Ashlee recently told People of her life at present. 'I love my husband, we have a beautiful family, I love his family… It’s wonderful.'

Evan, 26, was dressed for success too in an Aztec-inspired, patterned jacket with black jeans, white shirt and wide-brimmed black hat.

Jessica couldn't help cooing over her husband Eric Johnson, 35, and enjoyed posing with him with both arms wrapped around his waist.

Fit and fabulous: The fashion designer displayed a slender waist and toned arms thanks to regular workouts

Fit and fabulous: The fashion designer displayed a slender waist and toned arms thanks to regular workouts

Loving life: Ashlee recently said that married life with Evan Ross 'is amazing... I love my husband, we have a beautiful family, I love his family… It’s wonderful'

Loving life: Ashlee recently said that married life with Evan Ross 'is amazing... I love my husband, we have a beautiful family, I love his family… It’s wonderful'

Not long to go now: The singer-actress is reportedly due to give birth to the couple's baby girl in June

Not long to go now: The singer-actress is reportedly due to give birth to the couple's baby girl in June

Fired up: Mario Bello was also in attendance and brightened up her white blouse and dark jeans with a orange floral scarf

Fired up: Mario Bello was also in attendance and brightened up her white blouse and dark jeans with a orange floral scarf

Eric matched Jessica's stylish look in a black suit and tie.

The Gleason Project is a full-length documentary about former New Orleans Saints football player Steve Gleason who was diagnosed with ALS in 2011.

The film was shown to an exclusive party that, in addition to the Simpson girls and their spouses, included Maria Bello.

She's going to be a grandma: Evan's mom Diana Ross was seen shopping at Barneys New York in Beverly Hills on Thursday

She's going to be a grandma: Evan's mom Diana Ross was seen shopping at Barneys New York in Beverly Hills on Thursday

 

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