A representative for Lively, 23, and Badgley, 23, has confirmed the split.The Gossip Girl stars started dating in 2007 after meeting on set.
The couple have ended their three-year relationship, just like their on screen characters Serena van der Woodsen and Dan Humphrey.
However, it seems that the early stages of the plan work a little too well, and John and Kate end up falling for each other for real.
John Tucker Must Die also stars Jenny Mc Carthy, Penn Badgley, and Dan Payne.
That doesn't mean he doesn't wish them well: Back in September, shortly after Lively wed Reynolds, E!
News caught up with Badgley at the Toronto Film Festival, where the actor said he was "happy" to hear of his ex's nuptials."That's great," he added.