Happy Birthday, Knox and Vivienne!

To celebrate their twins turning seven-years-old on Sunday, July 12, Brad Pitt, 51, and Angelina Jolie, 40, reportedly took their two youngest children ice skating in LA.

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Knox and Vivienne with Angelina in June 2014.

“They rented a bus and headed for an afternoon of ice skating at Iceland Ice Skating Center. Knox and Viv were bundled up with snow hats and mittens. They were really excited about it," an eyewitness told Us Weekly of the fun outing.

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The A-list couple's four older kids, Maddox, 13, Pax, 11, Zahara, 10, and Shiloh, 9, and a few of the twins' close friends also joined in on the birthday festivities, according to the magazine.

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Pax, Brad, Angelina, Zahara, Shiloh and Maddox at the Maleficent premiere. Note: Vivienne is not pictured.

“Everyone skated for about two hours and they tried out special bumper cars on the ice. 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," the source added.

Sounds like a birthday for the books!