The 26-year-old California Gurls singer said she even trusts the once-time womaniser not to cheat because their relationship is so strong.
She told Now, 'Like Ludacris rapped, 'I'm a lady in the street and a freak in the bed'. I can't rate myself, but if you ask Russell I'm sure he'd give me 10 out of 10.
'He's made no secret of what his life was like before me, but that's then and this is the future.
'He's cheated in the past but he knows how good he has it with me and I know he'd never do anything to jeopardise that. I trust him 100 percent.'