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Almost Famous baby, totally famous party crowd!

Kate Hudson was the guest of honor at a private home in Malibu on Sunday afternoon -- where Jen Meyer (actor Tobey Maguire's wife) and 90210 actress Sara Foster hosted a not-so-casual baby shower for the star. (Hudson, 32, is pregnant with her second child, and her first with fiance Matt Bellamy of the band Muse; she an ex Chris Robinson share son Ryder, 7.) The Spanish-style ranch where the bash took place is situated in the same gated community where Camille Grammer, Olivia Newton-John and Mel Gibson live.

Dressed in somewhat formal attire, fellow celebs (and moms) like Courteney Cox, Nicole Richie and Rachel Zoe were among the day's 60 or so guests -- some of them bearing baby baskets and gifts in the gender-neutral color of yellow and green. Leaving everyone guessing about whether it's a boy or girl, ribbons and signs outside the Spanish-style estate were similarly decked out in pink, blue and yellow ribbons.

Still, even with some dressed-up revelers, a source tells Us Weekly, "it was a family-friendly party with kids of all ages running around. Nicole Richie was there with her kids and they were having a great time playing outside." Well-wishers hung out in the backyard and noshed on appetizers -- and joined in on tons of baby shower games.

"The best one was where people tried to guess what Kate and Matthew should name the baby," the source says. "It was hilarious and got a lot of laughs out of everyone! It was such a fun party -- and people stayed for hours."