After Brit's Sloppy Seconds?

4/23/2007 10:55 AM PDT BY TMZ STAFF
Paris Hilton and Kevin Federline together in Vegas -- say it isn't so!

Our friends at spotted the two partying together at Tao in Vegas on Friday night, posing for photos at a birthday bash for club co-owner Jason Strauss. K-Fed's gang sign W obviously stands for WTF.

No unholy union here though -- Hilton's boyfriend, Josh Henderson, was with her at the party.