London, Aug 9 - Singer Peter Andre says his ex-wife Katie Price has hit him below the belt by letting their four-year-old son see her in bed with her new lover. He has now branded her as 'disgusting'.

The 36-year-old singer says 'it was a knife in the heart' when Junior asked him why mummy was in bed with another man. 'Not just that, it was a knife, a twist and a lift,' he added.

Katie, 31, is right now living with 34-year-old cage fighter Alex Reid at the Surrey home she used to share with estranged hubby Pete. And Junior saw his mum in bed with her new boyfriend last week while was looking after her three children.

Andre, who split from Katie 14 weeks ago, revealed his anguish as he slammed his ex-wife.

He said: 'I heard Junior had been asking why mummy was in bed with another man. I didn't believe it. I just thought it was kids saying things. But Junior has said it to me since. It's something a four-year-old should not be saying. I can't even bring myself to say the other name, but Junior just said, 'Why is he in bed with Mummy? What is he doing in Mummy's bed?'

'That's the most disgraceful thing I have ever heard. Ever.'