Though they once seemingly had staying power beyond their Gossip Girl characters, co-stars Blake Lively and Penn Badgley have ended their three-year relationship, a couple confirmed to Us Weekly Wednesday. The 23-year-old actors reportedly broke up in mid-September. “They’re professionals,” an insider told Us Weekly about their working relationship. “They're still good friends and hang out on the set." But the private pair allegedly stayed mum on the split. "Nobody on set had any idea," the insider said.