Is Nicole Richie getting Paris Hilton's sloppy seconds!?

Is Nicole Dating Paris' Ex?

Richie seen shopping with a new man

Estranged best friends Paris Hilton and Nicole Richie still have one thing in common -- the same taste in men.

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Richie was seen Wednesday shopping in Hollywood with one of Paris' exes, professional skateboarder Chad Muska.

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Paris and Chad dated back in 2004 and are seen here shopping at celeb fave Kitson.

Could the smiling Nicole and Chad really just be friends?

If not Nicole might want to be careful. Paris has been known to get jealous when her friends hang with her ex-boyfriends (case in point: Lindsay Lohan & Stavros Niarchos). Or wait -- maybe that's the point.