Zachary Levi & Caitlin Crosby Split

Chuck actor Zachary Levi, 29, has pulled the plug on his two-year relationship with singer Caitlin Crosby, 26.

“He broke up with her on Saturday after his big NBC premiere aired,” a source tells Us Weekly. “He told her it was bad timing and if God brings them together in the future it’s meant to be. This isn’t the first time [they've broken up before]… She is heartbroken, but she is already writing great songs about it.”

After the break-up, Caitlin tweeted a positive note: “To a new year & new beginnings.”

Tonight’s guest on The Tonight Show with Conan O’Brien? Zachary Levi.