Mary-Kate Olsen has defied biology and may be pregnant. Sources are claiming Mary-Kate and artist boyfriend Nate Lowman are expecting their first childHey, if Nicole Ritchie can do it, anyone can, right? The frail starlet was seen looking normal-sized, which means she MUST be knocked up! This seems to be run-of-the-mill Hollywood logic—a few extra holiday pounds, and viola! A child is born!

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more baby news after the jump…

A “source” told The Post Chronicle: