Holly Madison follow's Kate Middleton's lead: Pregnant Playmate hospitalized over morning sickness

Holly Madison, former Playboy Playmate and ex- No. 1 girlfriend to Hugh Hefner, has done what Kate Middleton has done. She checked herself into the hospital for extreme morning sickness.

Madison, who has been showing off her baby bump around Las Vegas, tweeted a photo of herself in fuzzy pajamas with an IV in her arm. The caption reads, "Almost 7 months and morning sickness took hold! Glad to be otherwise ok, tho."

Prince William's baby mama, Kate, is also in a London hospital for pregnancy sickness, and is expected to remain there for several days.