When he's not making babies or conducting dubious promos for, um, we're not sure, Kevin Federline is seriously serious about his music. For all the doubters, he's dropped the white tanks on his album cover in favor of a tie, offering up his best Ryan Phillippe-esque stone-cold glare (sans pout).

Still not convinced? How about having Britney Spears make a guest appearance on the album? Even if she is his wife. And his babies' mama.

'Playing With Fire' hits stores on Oct. 31. Trick or treat?