The busty blonde, 32, signed up to star in the raunchy Peepshow, in which she appears topless, in 2009, but she has decided not to renew her contract once it expires later this year (12), in the hope of falling pregnant.
Madison, who has been dating businessman Pasquale Rotella since last year (11), tells America's People magazine, ""I'm not pregnant right now, but if that happened tomorrow I'd be fine with it.
""I've wanted kids and that's something I'm definitely doing as soon as possible. It is something that the time in my life is right for. Definitely being with the right guy has a lot to do with it. My relationship is awesome. I'm happier than I've ever been in my personal life.""
Madison's decision to quit comes days after her former Playboy Mansion housemate Kendra Wilkinson announced she will no longer be baring her boobs or stripping off - because she doesn't think it's appropriate for a happily married mum to be naked in public.