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Maddox Jolie-Pitt, Pax Jolie-Pitt

FAMEFLYNET PICTURES

Ah, it seems like only yesterday we were introduced to Angelina Jolie and Brad Pitt's eldest kids, Maddox and Pax.

But there they were over the weekend looking anything but tiny tykes as the two siblings stepped out for a bite to eat with a bodyguard in Woodland Hills, Calif, on Saturday.

In fact, given his height, Maddox actually looked quite a bit older than 11 while strolling alongside his 9-year-old brother.

Maddox sported a WWZ tee, likely a nod to dad's upcoming World War Z flick. Pax, meanwhile, rocked an iconic Nirvana shirt.

Yep. They grow up so fast!