John Mayer, Allison Williams Dating, Or Just Good Friends?

Which 'Girls' Star Is He Spending Extra Time With?
FILE - In this Tuesday, Feb. 17, 2009 file photo, musician John Mayer attends the "Armani 5th Avenue" store opening party, in New York. Taylor Swift has never revealed her target in the scathing song "Dear John," but Mayer's pretty sure it was about him. In a new Rolling Stone interview, Mayer called Swift's "Dear John" cheap songwriting and said it made him feel terrible and he didn't deserve it. (AP Photo/Evan Agostini, File)
FILE - In this Tuesday, Feb. 17, 2009 file photo, musician John Mayer attends the "Armani 5th Avenue" store opening party, in New York. Taylor Swift has never revealed her target in the scathing song "Dear John," but Mayer's pretty sure it was about him. In a new Rolling Stone interview, Mayer called Swift's "Dear John" cheap songwriting and said it made him feel terrible and he didn't deserve it. (AP Photo/Evan Agostini, File)

Is John Mayer back to his philandering ways?

The 35-year-old singer was spotted at a party in New York last weekend with one of the stars of "Girls," Allison Williams, reports the Daily Mail. The two, who showed up at a private event at the Jane Hotel in Manhattan's West Village, "walked in together and separated to talk to respective friends," a source told Daily Mail. "They then made their way back to each other, and John had his arm around Allison's waist. They talked together for a bit before leaving."

The musician and the actress then "headed to dinner at West Village Mexican hotspot El Toro Blanco," per Daily Mail, where they were joined by a third person. Williams' boyfriend, perhaps?

Williams, 25, has been dating Mayer's good friend and the founder of College Humor, Ricky Van Veen, for nearly two years. Whether they're just being good pals or if there's more to it, we're not sure.

The "Your Body is a Wonderland" singer, just last week, attended the presidential inauguration with girlfriend Katy Perry. Their relationship was rocky at the beginning -- Perry was getting over her divorce from comedian Russell Brand, Mayer was having a hard time settling down -- but recently the two were rumored to be moving in together.

Meanwhile, Williams' star is on the rise, and she's been charming audiences and talk show hosts alike for the past several weeks.

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