Hugh Hefner's favourite girlfriend Holly Madison is planning to get pregnant.The blonde beauty sparked rumors she was pregnant when she didn't drink on a recent holiday in Monaco.Fellow live-in girlfriend Bridget Marquardt has revealed, while Holly is hoping to have a baby with Hugh, she is yet to conceive. Bridget - who also shares Hugh with Kendra Wilkinson - told the New York Daily News newspaper: "Oh, that's not true! Holly got wasted in Monte Carlo! We had a giant margarita glass in the middle of our table full of four bottles of booze, and we were all drinking."She does want to have Hef's babies, but I think she wants to wait until we're done shooting 'Girls Next Door' and Kendra and I aren't there anymore.She wants to have a normal environment."Bridget, however, revealed Playboy mogul Hugh, 81, is not as keen as Holly,27, on the idea.She said: "I know he's not ready for kids yet."He's still sexually active. Maybe he'll be ready when the show ends."I'm ready to throw the baby shower though!"Earlier this year, it was reported that Hugh and Holly were engaged.A source said: "This is very secret, but the word is 'yes.' Hef' has decided he will marry Holly, and he wants it for his TV show."Hef' thinks business all the time, and looks for a new hook, although he also does really love Holly."Hugh's first wife was Mildred Williams, who he wed in 1949. The couple, who divorced in 1959, have two children, Christie and David Paul.In 1989, Hugh married Kimberley Conrad - that year's Playboy Playmate. They separated in 1998.