(Cover) - EN Showbiz - Kristen Bell says she intimidated Russell Brand by threatening to hit him in his genitals if he tried to flirt with her.

The two stars appeared alongside each other in 2008 movie Forgetting Sarah Marshall, playing lovers. Shooting took place before Russell met his now-wife Katy Perry, and when he was still renowned for being a lothario. Kristen admits he did show an interest in her when they first met, but she soon put a stop to his advances.

I made it really clear from the beginning that I would sock him in the b***s if he tried anything. So he was intimidated, truth be told, she said. Actually, I loved working with Russell. I may be the only woman in the world who would shout that from the rooftops, but I did.

Kristen explained Russell isnt like his public persona in real life, and is actually very caring and fun to be around. They had a great time working together, with the actress insisting Russell is a really sweet boy, underneath that wig.

Although they ended up making a great team, Kristen was initially unsure they would have any on-screen chemistry. She couldnt believe what Russell was wearing when she was first introduced to him, and was dismayed by how tight his trousers were.

I had a hard time keeping a straight face when he was around and every time I saw him, Id think, This dudes got a better figure than I do, she laughed to British newspaper The Daily Mail. (C) Cover Media