Kevin Federline, Paris Hilton Party in Las Vegas

Paris Hilton and Kevin Federline.

Together in Las Vegas, Nevada.

What could be more perfect?

Plenty of things. Namely Kristin Cavallari in a wet t-shirt... but that's a subject for another time. When SpyOnVegas.com spotted the great FedEx and Paris Hilton partying together at Tao in Vegas on Friday night, posing for photos at a birthday celebration for the club's co-owner, Jason Strauss, it certainly seemed appropriate.

After all, both have seen Britney Spears' crotch up close. No word on what K-Fed's "W" sign in the pic below is meant to represent. We're guessing it is a shout out to a certain "wigger." 

We're sad to report that Federline, who is rumored to have tapped the booty of Lindsay Lohan lately, did not get busy with Paris. Hilton's boyfriend, Josh Henderson, was with her at the party.

The former Mr. Britney Spears did enjoy the company of a bevy of blondes at the Bare Pool Lounge over the weekend, though (see above). K-Fed hit up the topless sunbathing paradise - and quickly got his drink on.

Just who is watching Sean Preston and Jayden James is what we would like to know. At least if K-Fed has a mental meltdown, he's already got the shaved head thing over with.