The 42-year-old actress wrote in her autobiography that she kept this incident a secret as she didn't want her then husband to create a scene, the Daily Star reported.
The 'Britain's Got Talent' judge explained that she was cornered by the comedian while she was coming back from the loo, at a public event which she had attended with Dennis.
She resisted as the unnamed celebrity tried to kiss her and put his hands in places that he shouldn't have.
When she caught the sight of their reflection on a mirror, her body went limp as he groped and nuzzled her.
Holden and former husband Dennis separated in 2003 and now she is married to music producer Chris Hughes.
--ANI (Posted on 16-10-2013)