Brad Pitt and Angelina Jolie took their kids ice skating for Knox and Vivienne's 7th birthday party - all the details Credit: Steve Granitz/WireImage

Happy Birthday! Angelina Jolie and Brad Pitt’s twins, Vivienne and Knox, are all grown up. The husband and wife duo took their kids ice-skating in L.A.'s Van Nuys nabe, to celebrate their 7th birthday on Sunday, July 12, an eyewitness tells Us Weekly.

Knox and Vivienne’s older siblings Maddox, 13, Pax, 11, Zahara, 10, and Shiloh, 9, of course, also joined in on the fun day. 

“They rented a bus and headed for an afternoon of ice-skating at Iceland Ice Skating Center,” the source tells Us, adding that the brood were joined by a few of Vivienne and Knox’s pals. “Knox and Viv were bundled up with snow hats and mittens. They were really excited about it.”

“Everyone skated for about two hours and they tried out special bumper cars on the ice,” the eyewitness adds. “They were spinning around getting dizzy and had a blast. Some of the kids were holding hands as they skated and it was really sweet.”

After whooping it up on the rink, the eyewitness noted the kids were “wiped out” before they got on their bus to go home.

Little Vivienne is already following in her famous mom’s footsteps. During a March 2014 chat with Entertainment Weekly, Jolie revealed she was the only one of her kids who could act alongside her in Disney’s Maleficent. “It had to be Viv,” she said. “The other 3- and 4-year-old [actors] wouldn’t come near me. It had to be a child that liked me and wasn’t afraid of my horns and my eyes and my claws. When Pax saw me for the first time, he ran away and got upset.”

Can't get enough of Us? Sign up now for the Us Weekly newsletter packed with the latest celeb news, hot pics, and more!