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Friends co-star David Schwimmer (Ross) directed this episode, in which the father of Rachel's baby is finally identified -- or is he? Crucial to the plotline is a red sweater, left behind by the "mystery man." Joey (Matt LeBlanc) shows the sweater to Phoebe (Lisa Kudrow), who, convinced that the mystery is solved, arranges an "accidental" meeting between Rachel (Jennifer Aniston) and the sweater's owner. Meanwhile, Joey goes off on the wrong track when he thinks that it is Phoebe who is pregnant; an anxious Monica (Courteney Cox) considers breaking her promise to Chandler (Matthew Perry) about waiting to open their wedding presents; and Chandler and Ross try to cover up the fact that they've lost all the wedding pictures.