Holly Madison claims she was bullied at the Playboy Mansion.

The former 'Girls Next Door' star, who split from Hugh Hefner in 2008 after seven years of dating, says she was subjected to ''ruthless taunting'' and her self-esteem started ''to crumble'' after she moved in with him and his other girlfriends.

In her new memoir, 'Down the Rabbit Hole: Curious Adventures and Cautionary Tales of a Former Playboy Bunny', the 35-year-old beauty writes: ''Prior to moving into the mansion I'd been a fairly confident person, but it didn't take long for my self-worth to start to crumble.

''After being identified by the other girlfriends as persona non grata, I had become the victim of their ruthless 'mean girl-ing.' During dinners or movie screenings, it wasn't out of the ordinary for me to overhear their loud whispers criticising my appearance (my hair, my face, my clothes.

''According to their ruthless taunting, I was the 'thick girl' from Nowheresville, USA. They found my optimistic attitude corny and my confidence threatening, so they did whatever they could to tear me down. Sadly I have to say it worked.''

Holly claims the other girls also stole her clothes and she ''reverted to writing my name on the inside of each label like a third grader going away to camp''.