Stefani takes son Zuma on one exciting ride at a Beverly Hills park. Plus: Penn Badgley, David & Brooklyn, Mo'Nique and more

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PARTY HEARTY

A costumed Penn Badgley celebrates his 23rd birthday Saturday night at the SVEDKA "Adult Playground 2033" party at 1OAK in N.Y.C. with friends – and a giant cake! The Gossip Girl star was joined by girlfriend Blake Lively, who donned a brunette wig and a flight attendant costume.