06/04/2012 AT 11:45 AM EDT
Mom-to-be Reese Witherspoon
presided over a big day of extended family fun – complete with cheeseburgers, ice cream and even hair makeovers – over the weekend.
The expectant actress was hanging out with kids Ava, 12, and Deacon, 8,
at the Kidstock Music and Arts Festival held at Beverly Hills's Greystone Mansion, which benefits the One Voice and the One Voice Scholars Program. Joined by hubby Jim Toth, her brother (and his two girls), Witherspoon rubbed her pregnant belly
and smiled widely as her kids enjoyed some musical entertainment by Jim Belushi's daughter, Jamison.
Later, the whole family moved over to the Drybar Station, where the younger girls got their hair done. (Ava got pink streaks and glitter put in!)
Then it was time for some food: specifically cheeseburger sliders, chicken skewers and some French fries for Reese.
Her husband was very attentive (and affectionate), making sure she was well-fed, according to onlookers. And the two enjoyed an especially sweet – literally – moment, sharing a bite of Baskin Robbins ice cream together before heading over to create custom jeans with the kids at the Hudson Jeans booth.
Also at the event: Victoria Beckham
, who arrived early with all four of her kids
in tow. (She kept daughter Harper in her arms for most of the afternoon.) Her boys hit up the Drybar station, where they got Mohawks and purple streaks in their hair.
And Pete Wentz
and girlfriend Meagan Camper
chaperoned his son Bronx at the event, which also drew out Kylie Jenner.