Exes Taylor Lautner and Lily Collins Reunite at British Abduction Premiere

USMagazine, Monday, September 26, 2011, 1:31pm (PDT)

This is why you should never fall in love with your costar.

Days after Us Weekly broke the news that Taylor Lautner and Lily Collins ended their one-year romance, the Abduction actors reunited to promote the thriller in London Monday.

PHOTOS: Love lives of Twilight's stars

Though they posed side-by-side, neither Lautner, 19, nor Collins, 22, cracked a smile for photographers during the red carpet reunion.

VIDEO: Watch Taylor strip down in Eclipse

And while Lautner has raved about the chemistry they once shared, audiences weren't nearly as enamored with the two actors: Abduction debuted with a disappointing $11.2 million in its opening weekend.

PHOTOS: Hollywood's friendliest exes

What caused the young costars to split just one week before the film's L.A. premiere?

"It was a clean break that Taylor initiated," a source told Us, noting that they "barely said a word to one another" at the Abduction afterparty in L.A. September 15.

PHOTOS: Taylor and his costars in Breaking Dawn - Part 1

Despite his newly single status, the source added that Lautner isn't ready for another romance just yet: "He wants to be single for awhile."

Get more Us! Follow us on Twitter, Friend us on Facebook, Subscribe to Us Weekly