All together! It seems Sofia Richie is still more than comfortable around Scott Disick's kids, as she appeared to play the role of stepmom on Saturday / Rol-Ax/

At 19, many teens earn extra cash with a spot of babysitting.

And while, unlike her peers, Sofia Richie may not need the money – thanks to her singer dad Lionel Richie – the teen found herself helping out with three spirited kids on Saturday.

With Kourtney Kardashian on a romantic break to celebrate her beau Younes Bendjima‘s 25th birthday, Sofia’s 34-year-old boyfriend Scott Disick is on daddy duty.

And Sofia proved she’l more than comfortable around his three kids, as shejoined them for a family lunch on Saturday.

The two – who have been dating a year – took his kids to the ritzy Nobu sushi restaurant in Malibu for lunch.

Sofia donned a white sleeveless crop top for the outing, which offered up a glimpse of her toned midsection.

She also opted for a pair of dark wash Daisy Dukes that showcased her lithe legs.

Some gold hoop earrings and a gold chain necklace added a bling factor while some whimsical blue frame plastic shades shielded her eyes from the bright sun.

Her brunette locks were parted in the middle and pulled tightly back into a compact bun.

Beau Scott also kept his sartorial choices quite casual.

The father-of-three opted for a olive drab t-shirt paired with matching trousers and light beige trainers.

He also wore a pair of sunglasses, yet added even more sun protection with a ball cap.

Sofia looked right at home with Scott’s progeny, and even carried his son Reign, aged three, in her arms.

The little boy looked as though his dad may have been his style template, as he was wearing olive-hued camouflage and khaki pants for the family fun.

Penelope, aged five, was also present and sported a simple white tee.

Later Scott posted a snap of Penelope in an empty inflatable swimming pool with the ominous caption ‘slime time’

He then went on to document his kids’ getting their hair cut, captioning the share ‘squad cuts.’

Finally, he showed Reign and Penelope adorably roughhousing on a bed.

Hours later, Sofia was spotted stepping out without Scott.

She swapped her crop top and shorts for mustard colored high-waisted trousers and a tucked in white T-shirt.

The teenager added Chanel sneakers and delicate jewelry.

She was in the Los Feliz neighborhood of Los Angeles for her Saturday early evening outing.

Meanwhile, Scott’s ex Kourtney Kardashian, 39, appeared to be enjoying some her-time away from the kids.

Kim’s older sister shared a very hunky photo of her boyfriend Younes Bendjima on Saturday.

The TV star was wishing her handsome beau a happy 25th birthday on social media. The Calabasas native also hinted that she was taking him on a dream vacation on her private jet.

Kourtney and the catwalk king have been dating for just over a year.