Bob Geldoff grabs Sharon Osbourne's backside in X-rated clinch

Peaches Geldoff is more used to being called a bum ... not her father Sir Bob.

But he looked exactly that when he larked around at a charity event and grabbed Sharon Osbourne's backside.

Sir Bob showed his cheeky side as he grabbed Sharon Osbourne's backside looked on by a laughing Anna Kournikova

Sharon also showed she was in a touch-feely mood by grabbing a woman's breast

The former Boomtown Rats singer and Sharon joined ex-tennis star Anna Kournikova at an American AIDS charity event in Virginia.

Sharon showed her serious side when she took to the lectern to give a speech - and ended up looking a lot like vice-presidential hopeful Sarah Palin.

After falling out with Simon Cowell, Sharon has found a new hero to copy - vice-presidential hopeful Sarah Palin