Rita Ora doesn't think Miley Cyrus has crossed the line with her recent outrageous antics.

The 'Shine Ya Light' singer has defended her fellow pop star's controversial actions of late - which include her steamy performance at the MTV Video Music Awards in August and appearing naked in her new music video for 'Wrecking Ball' - insisting there are no boundaries to a musician's artistic expression.

Speaking to BANG Showbiz ahead of 'Unity: A Concert for Stephen Lawrence' at London's The O2, she said: ''There is no line. The greatness about what we do is you can do whatever you want. There's no line in my book. Madonna never had a line. I think it's just about how far you want to take it. I don't think it's anyone's place to draw a line for you.''

Although the 22-year-old R&B star is quick to defend the 'We Can't Stop' hitmaker, Rita says she has no plans to emulate booty-shaking Miley's twerking dance moves.

She added: ''It's about how you want to be perceived. If it's who you are and that's how you want to be perceived then I am all for it. It's a personal preference - she her way, I have my way. Everyone's different. I can't twerk!''