9x13 "The One Where Monica Sings"

Phoebe suggests that Monica sing at Mike's piano bar. After some doubt, Monica does. The audience loves her but only because when the light is on her they can see her breasts as she isn't wearing a bra. Meanwhile, an angry paranoid Ross is thinking Rachel is moving on 'without the courtesy of telling', tries desperately to find a date. Rachel, wanting to talk with Ross, realizes their situation isn't working and decides to move back in with Joey, taking Emma with her.