Since Hollywood is pretty much like an exclusive high school clique, it's no surprise that Gwen Stefani would be kickin' it at the park with Tobey Maguire's wife (and the daughter of Universal Studios' CEO), Jennifer.

And, of course, it's only natural that their kids would become playmates, right? How cute do little Zuma and Ruby look together?

Speaking of cute:

Gwen Stefani