Aug. 15 2007, Published 6:00 a.m. ET

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Though mom-to-be Nicole Richie has had many fans worried in recent months with her ever-thinning figure, the former Simple Life star is doing her best to get into shape. In Manhattan with her beau Joel Madden, whose band Good Charlotte is opening for Justin Timberlake at Madison Square Garden tonight, Nicole headed to the Equinox gym on ritzy Park Ave. to add some muscle to her petite frame. 'She looked very pregnant,' one eyewitness tells OK!. 'She was there for around 90 minutes to two hours. And she was with a bald guy. He looked like her trainer or bodyguard.'After stints of cardio and weight training, Nicole, who must complete four days of jail time in Los Angeles by Sept. 28 as part of a plea agreement in her recent DUI arrest, walked right out the front door and around the building to where a car was waiting for her.For the details on Nicole's upcoming autumn wedding, check out the new issue of OK!, on sale Aug. 16.By: Jocelyn VenaPhoto:

Nicole Richie
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