Colbie Caillat Sings Phoebe's "Smelly Cat" From "Friends" At Central Perk Pop-Up: WATCH
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Sadly, she didn't break out into the full song, as almost the entire gang (sorry Ross) did at this epic jam-in at the fictional Central Perk:
[gdm_video source="youtube" video_id="W7jlGRq8xZ4#t=52" url="http://www.youtube.com/watch?v=W7jlGRq8xZ4#t=52"]
h/t: E! Online