Blake Lively and Penn Badgley
Gossip Girl stars Blake Lively and Penn Badgley have split, their rep tells TVGuide.com.
Check out photos of Blake Lively
The two, who have known each other since their preteens, had been dating since December 2007, shortly after the CW series premiered.
Are you going to watch next week's Gossip Girl? Tell us here
Their rep did not specify when the pair broke up, but Lively, 23, referred to Badgley, who turns 24 on Monday, as her boyfriend — and shared a prank she pulled on him — during her Oct. 1 appearance on The Late Show with David Letterman
Watch Lively's Letterman appearance: