Lily Collins and Jamie Campbell Bower have split up.

The 'Mortal Instruments: City of Bones' co-stars - who had been dating for over a year - recently called time on their relationship but have managed to maintain a friendship during the press tour for the movie.

A source told Us Weekly: ''They remain very good friends.

''They've been really good about doing the press tour together for their movie. They were able to stay friendly.''

Speculation about the end of their relationship first began in July when Jamie was spotted making out with fashion blogger Zina Charkoplia at a music festival in Portugal.

Zina posted a number of pictures to her Instagram, of herself and Jamie kissing and cuddling.

Lily previously opened up about falling for Jamie on set, although they admitted filming their love scenes was ''super awkward''.

She said: ''In terms of kissing, I promise you that it is super awkward and super unsexy because everyone's staring.

''People are cast because they have chemistry. You're spending 24-hour days together and it's intense... plus you really get to know the best and worst sides of people - the rawest sides of people.

''You're perfect for the role because you have that connection with each other and sometimes that translates into more.''

Jamie, 24, was once engaged to his 'Harry Potter and the Deathly Hallows: Part 1' co-star Bonnie Wright but they split up in June 2012, one month before he was linked to Lily.

Lily also has a history of dating co-stars after a romance with Taylor Lautner, who she met when they worked on 'Abduction' together.