Romance goes cold for Collins and Campbell Bower

UNITED STATES - It's over between The Mortal Instruments: City of Bones co-stars Lily Collins and Jamie Campbell Bower.

The pair were first linked last year after meeting on the set and were thought to be the second coming of reel-to-real Twilight couple Robert Pattinson and Kristen Stewart.

Even though the British-American actress and British actor, both 24, are currently promoting their movie together across the US, the romance has fizzled out.

Both "remain very good friends", according to Us Weekly.

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