It's by Fleetwood Mac:
It's funny to watch Paul Rudd dance to this song in the 12-7-2013 episode.
Too bad that's not on YouTube,
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Jennifer Lopez Outfit on Britain's Got Talent
SteveStreza.com » So I Made A Mashup, And Then…
The Veronicas "Cruel" sounds like AJ and Aly "Potential Breakup Song".