Kevin Federline may have kept away from the party scene since gaining sole custody of his sons, but there's one bash he didn't miss: his own birthday party!

Sporting a stylish grey suit with a powder blue shirt and coordinating necktie, Britney Spears' ex-hubby hit Las Vegas' Pure Nightclub on Friday night to celebrate his 30th birthday, which he said he felt "great" about.

According to People, the aspiring rapper was welcomed to the club by a bunch of his friends, including family members, ex-wife Shar Jackson and his lawyer Marc Vincent Kaplan, before heading to his VIP table.

"I lost my voice at the craps tables and I lost all my money," Federline rambled on at one point encouraging everyone to have a good time as he got his hands on a microphone, before a pal dragged him away. After several hours of singing, dancing and drinking, Federline left the club before 2 AM and headed back to his Caesars Palace suite.

Inside sources claim the former backup dancer may have been paid as much as $175,000 in appearance fees to play the host at his birthday party.  

In the meantime, his two sons, Sean Preston, 2, and Jayden James, 1, remained in the care of their nanny and a bodyguard, and were spotted by X17 photographers having a good time on their own at one of the My Gym Children's Fitness Centers.