Britney's Brand New Toy

1/29/2008 9:41 PM PST
Britney Spears is tooling around right now in her new SLK 350 Mercedes Benz, which was delivered just minutes ago to her house in Beverly Hills ... with the top down, of course!

We're told Brit's new ride is a black on black two-seater for which she shelled out, in full, $55,000 cash. Sources close to the deal tell us she picked it out on Saturday, but signed the papers today.