Katy Perry, John Mayer cozy up at Allison Williams' wedding
Monday, September 21, 2015 - 10:00
in Mathematics & Economics
Annie MartinSARATOGA, Wyo., Sept. 21 (UPI) -- Katy Perry and ex-boyfriend John Mayer appeared to be back on again as they held hands at Allison Williams and Ricky Van Veen's wedding.