Justin Timberlake, Britney's first serious boyfriend, would be proud, because the pop princess from Kentwood, La., is definitely bringing sexy back.

She filed for divorce all of two days ago, but Britney Spears is not wasting any time showing her estranged, jackass husband what he's going to be missing.

Flying to New York immediately after her final blowout with Kevin Federline, Britney did some ice skating with friends in Rockefeller Center (left), looking cute as ever.

Later, she made an appearance in a jaw-dropping blue dress that brought back memories of some of the classic, pre-Federline Britney Spears pictures.

The mother of little Sean Preston and Jayden James Federline is clearly making a statement that she's about to be back on the music (and dating) scene. And boy, are we happy to see it.

Wrestling star John Cena may have given K-Fed the most demonstrative F-U last month (his patented move is the F-U slam), but it appears Britney and her newly svelte figure are not-so-subtly sending Kevin Federline a similar message: