Nutter parties with James Taylor, Katy Perry & others at White House

It looks like Mayor Nutter attended the exclusive White House inaugural after-party that raged on to at least 3 a.m., when POTUS was still partying it up with the likes of Katy Perry, Kelly Clarkson and James Taylor.

No word yet on how late Nutter was there.

The mayor - not to be confused with John Mayer, also in attendance - tweeted a picture of Janelle Monae performing in the East Room on Monday evening, writing: "Pres @BarackObama and 1st Lady Michelle Obama jamming at the White House with Janelle Monae kicking it out!"

h/t to Politico and the Boston Globe for the party deets.