Australian actress Sophie Monk has sent her best wishes to her former fiance Benji Madden amid reports he is engaged to Hollywood star Cameron Diaz.

Monk and Madden ended their engagement in 2008 and the Good Charlotte rocker went on to date socialite Paris Hilton.

He is now believed to be engaged to Diaz after a whirlwind romance, and Monk insists there are no hard feelings between them.

She says, "I want him to be happy, so if he's found someone that makes him happy that's awesome.''

Monk adds of Diaz, who is eight years her senior, "I remember being in Year 8 (at school) or something and looking up to Cameron and going 'Wow, one day I want to be funny and be in the industry', so it's kind of cool."