Kendra Wilkinson has branded Holly Madison a ''bitch''.

The 30-year-old reality star has slammed her former 'Girls Next Door' co-star over her recent autobiography, 'Down the Rabbit Hole', and despite them previously both living together in the Playboy Mansion as girlfriends of Hugh Hefner, she insists they were never friends.

In a clip from a forthcoming episode of 'Kendra On Top', Kendra told a friend: ''She writes a book putting rumours out there about me all over the Internet and stuff. It's just absurd.

''Seven years later and this bitch is talking about s**t that happened while I was fucking 18, 19 and 20.''

''At the end of the day, what we did was just ... f**ked the same man. That's not friends.''

In her book, Holly called Kendra one of the ''fakest'' people she'd ever met and claimed the blonde beauty tried to push her away, but the reality star insists the stories in the tome are all ''extremely false''.

She added: ''How dare her try to write my story and tell people what my intentions were when I know my intentions. She never knew my intentions. She can't go in my f***ing brain and tell people what my intentions were.''