Friday family fun! Hours after sister Kim Kardashian and baby North arrived home following a week-long hospital stay, Kourtney Kardashian stepped out with boyfriend Scott Disick and son Mason on Friday night, June 21, enjoying dinner at Sugarfish Sushi in Calabasas, Calif. 

PHOTOS: Kim's baby bump style

While little Penelope, 11 months, missed out on the family affair, Mason, 3, was smiling next to his parents, rocking comfy sweats and a bright orange tank-top. The E! reality star wore Chanel slip-ons, black spandex, and a safari-print tunic for the dinner, while Disick settled on white sneakers, green pants and a white long-sleeved shirt.

Kourtney, 34, hasn't commented yet on the June 15 arrival of her niece, North, but a source tells Us Weekly that Kourtney is loving being an aunt.

PHOTOS: Kardashian family album

"Kourtney says the baby is adorable," a source tells Us. "She loves her so much."

Besides fulfilling new auntie duties, Kourtney tweeted on June 20 that she has another goal for the summer -- to exercise more!

"I am starting to run again today!" she tweeted, adding a throwback picture of her running on the beach for a Shape magazine shoot. "Been too long."

PHOTOS: Kourtney's beach body

Kourtney and Disick, 30, have been dating since 2006.

This article originally appeared on After Kim Kardashian Leaves Hospital With North, Kourtney Has Night Out