Hollywood actress Cameron Diaz is reportedly excited about working with ex-boyfriend Justin Timberlake in the new film 'Bad Teacher'.

'They've been apart for years, but they stayed friends and the friendship has only gotten better over time,' the digitalspy.co.uk quoted a source as saying.

'Cameron loved Justin and they were always trying to come up with some project they could do together beyond 'Shrek'. She is very happy that 'Bad Teacher' worked out - Cameron was gunning for Justin to be in it with her and she had some influence over the choice.'

The insider added: '(Cameron) has been going through ups and downs lately between films and Justin's hiring made her feel better. Cameron loves working and now she gets to go to work with someone who knows her as well as her closest friends. It's a treat and she's already laughing.'

The source rubbished claims that Timberlake's current girlfriend Jessica Biel is unhappy about the reunion.

'(Timberlake) is making it clear that he's thrilled to be working with Cam again, but that's where the line is drawn. Jessica says she has no reservations about the movie,' said the insider.