The dancer-turned-musician-turned-actor hit up Pure Nightclub at Caesar's Palace, a popular spot that has also seen parties hosted by Federline's ex, Britney Spears, and friend Paris Hilton.
Sporting his trademark faux-hawk, Federline entered the party dressed in a gray suit and wearing a light blue shirt. He told People he felt "great" about turning the big 3-0.
Federline attended the soiree with around 20 friends, People reported. His posse included family members and his custody attorney, Mark Vincent Kaplan.
Once inside, Federline met up with his ex-girlfriend, Shar Jackson, with whom he has two children.
People reported Federline sang along to music from Kanye West and Jay-Z and his own song, "Lose Control." He also spent the evening drinking from a bottle of Jack Daniels, the magazine's Web site claimed.
Federline told fans to have "a good time," and said he lost his "voice at the craps tables and I lost all my money," People reported.
No worries necessarily though, as a judge ordered Federline's legal fees in the amount of $375,000 to be paid by Britney, earlier this week.
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Source: AccessHollywood.com, celebrity-gossip.net