Going it alone: Kourtney Kardashian has her hands full looking after the kids... as ex Scott Disick parties in Cannes with her mom and sisters

Her mother and two of her sisters are living it up in Cannes along with her estranged partner.

But on Tuesday Kourtney Kardashian kept focused on taking care of her young children while Scott Disick partied with Kim Kardashian, Kendall Jenner and momager Kris Jenner on the riviera.

Kourtney, 37, definitely had her hands full as she ran errands with her sons Mason, six, and Reign, one.

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Single mom: Kourtney Kardashian ran errands in LA on Tuesday with sons Mason, six, and Reign, one. The boys' father is her ex Scott Disick who's currently partying at the Cannes Film Festival

Single mom: Kourtney Kardashian ran errands in LA on Tuesday with sons Mason, six, and Reign, one. The boys' father is her ex Scott Disick who's currently partying at the Cannes Film Festival

The eldest of the Kardashian siblings also has a daughter Penelope, who's three.

She stepped out in ripped jeans and stiletto heels wearing a crisp white S&T shirt and a pair of aviator sunglasses.

The busy mom wore her long raven hair tied back into a simple ponytail.

Hands full: The 37-year-old seemed pensive as she carried her youngest while Mason followed behind

Hands full: The 37-year-old seemed pensive as she carried her youngest while Mason followed behind

Kick it like Kourtney in her Victoria Beckham sunglasses

Kourtney Kardashian enjoyed some fun in the sun with her children as she ran errands in Los Angeles. Her jeans and a tee-shirt ensemble was a classic and flattering look but she really upped the ante with a pair of Victoria Beckham sunnies.

We're crazy over those reflective gold lenses (perfect for keeping the paparazzi at bay). Metallics are such a hot commodity so Kourtney definitely made the right choice with these beauties.

Now that summer is almost here it's time to stock up on some shades. Take a cue from Kourtney and rock a pair of face flattering aviators. Click through to Avenue 32's website to get her exact ones for $950.

And if you're after a bargain, get it from the gallery below. With styles starting at just $14 there's something for everyone.

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Stylish: Kourtney wore ripped jeans with nude stiletto heels and a white t-shirt along with a pair of aviator sunglasses
Stylish: Kourtney wore ripped jeans with nude stiletto heels and a white t-shirt along with a pair of aviator sunglasses

Stylish: Kourtney wore ripped jeans with nude stiletto heels and a white t-shirt along with a pair of aviator sunglasses

Unit: Her boys were casually dressed in long-sleeved tops, sweatpants and slip-on canvas shoes. Not with them was Kourtney's daughter Penelope, three

Unit: Her boys were casually dressed in long-sleeved tops, sweatpants and slip-on canvas shoes. Not with them was Kourtney's daughter Penelope, three

Practically minded: The eldest of the Kardashian siblings wore her long dark hair pulled back into a ponytail and carried her smartphone in a back pocket
Practically minded: The eldest of the Kardashian siblings wore her long dark hair pulled back into a ponytail and carried her smartphone in a back pocket

Practically minded: The eldest of the Kardashian siblings wore her long dark hair pulled back into a ponytail and carried her smartphone in a back pocket

Following her lead, both her boys also wore white tops.

Mason paired his baggy long-sleeved sweatshirt with pale gray sweatpants and matching canvas shoes.

Reign wore dark gray pants with canvas slip-ons and cuddled into his mom as she carried him along the street.

Kicking back: Kourtney also shared a Snapchat video of herself waiting

Kicking back: Kourtney also shared a Snapchat video of herself waiting

Big eyes: The reality star added some filters to her waiting video

Big eyes: The reality star added some filters to her waiting video

Momager approval: Kris Jenner shared this photo of daughter Kendall, 20, and Scott partying in Cannes, while Kourtney was home in LA with Scott's kids

Momager approval: Kris Jenner shared this photo of daughter Kendall, 20, and Scott partying in Cannes, while Kourtney was home in LA with Scott's kids

While Kourtney's home with their children, Scott, 32, has been having a whale of a time hitting the star-studded film festival parties in Cannes.

He's also been relaxing with pals and a bevy of bikini-clad girls at a private villa overlooking the Mediterranean.

His antics seem to have metw ith the approval of Kourntey's mom Kris Jenner, 60, who happily posed a snap of Scott with Kendall Jenner, 20, enjoying a late night party.

The momager captioned the candid shot: 'A night with my kids!'

Single life: Scott, who split with Kourtney last summer over his cheating and partying, shared this photo to his Instagram showing himself sunbathing with some male pals at a private villa on the Riviera

Single life: Scott, who split with Kourtney last summer over his cheating and partying, shared this photo to his Instagram showing himself sunbathing with some male pals at a private villa on the Riviera

Living it up: Kourtney's mom Kris, 60, and sister Kim, 35, both showed off their curves at Cannes on Tuesday as they joined the party in Cannes

Living it up: Kourtney's mom Kris, 60, and sister Kim, 35, both showed off their curves at Cannes on Tuesday as they joined the party in Cannes

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