K-Fed paid $175,000 for Vegas birthday

Kevin Federline is celebrating his 30th birthday party at Las Vegas hotspot Pure on March 21. But instead of dropping dough on expensive champagne the former Mr. Britney Spears stands to earn $175,000. Say what? "Kevin is a big spender, and a draw for the crowds," an insider tells Pagesix.com. "So the money he gets is nothing compared to the money they make." A draw for the crowds? We know Vegas is cheesy, but when did this happen?! Spending a few days in Sin City means the boys, Sean Preston and Jayden, will have to stay with Britney, "But it all depends on how she is doing at the time," says the source. "Also, Kevin has to feel confident that Jamie [Spears] will make sure the boys are watched over at all times while she is with them." Six figures and he's removed from daddy duty? Looks life K-Fed is on the up-and-up!