Just like their "Gossip Girl" characters, Blake Lively and Penn Badgley were in a serious relationship for years that weathered a few rough patches -- until they finally broke up in 2010. She's now married to Ryan Reynolds, but still has to cozy up to her ex on set, as Seren and Dan continue to be off and on. Bet they're both glad the show is coming to an end...
Blake Lively and Penn Badgley
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