Miley Cyrus is ''over'' her split from Liam Hemsworth.

The 'Wrecking Ball' hitmaker broke up with her fiance last month and it is said commitment to her career has made her much happier.

An insider told E! News: ''She's doing really well. The Liam thing shook her up a bit, but she's over it now.

''She has thrown herself into work and she knows that it's for the best.''

The 20-year-old singer is reportedly optimistic about ''the future'', finding the situation and her success since the end of their relationship ''empowering''.

Her friend added: ''She's actually excited and hopeful about the future.

''She's proved that she doesn't need Liam to be happy or successful. The past few months have been incredibly empowering for her.''

News of Miley's happiness comes after speculation she is dating Rolling Stone magazine photographer and heir Theo Wenner, whose father Jann owns the music publication,

A source previously said: ''She's definitely dating him. Miley talks about how hot Theo is and how nice he's been to her.

''She's definitely in lust with him ... She said she's never met anyone as sweet as Theo.''