It's a family affair!

On Monday, stars swarmed the world premier of "Monsters University" at the El Capitan theater in Los Angeles.

Among the celebrity filled blue carpet were a few famous families -- from Gwen Stefani, Gavin Rossdale and their two boys Zuma and Kingston to Melissa Joan Hart and her baby, Tucker McFadden -- the premiere proved to be fun for adults and kids.

They weren't the only celebs at the premiere -- click "Launch Gallery" above to see Alessandra Ambrosio and her daughter Anja, the film's stars Billy Crystal and Charlie Day and more!

"Monsters University" opens June  21.

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