Britney: Undercover Lover!

It's a good thing Britney Spears has paid professionals raising her kids for her!

While she probably sleeps all day, the hard-pAArtying mother of two rages at night. And Monday evening was no exception.

Sources reveal exclusively to PerezHilton.com that the pop star was spotted at the W Hotel in Westwood, drinking heavily at the Whiskey Blue lounge.

"She entered in a short black and white dress with long black wig," recounts one spywitness. Britney sure is fond of her disguises!

Later on in the evening, Spears changed behind a screen at the bar into a men's white shirt and tiny black booty shorts.

"Britney was making out with a dark hair, bearded man outside in a cabana, but i could not recognize him," says our mole.

Then, after an amarous public makeout session, sources tell us that Spears and her mystery man went into the lobby and got a room for the night!!

And, like a true gentleman, the fella was the one that gave his credit card to the reception desk.

Now, the real question remains...

Who is Britney's new man?

Let his 15 seconds of fame begin!

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