Jessica Simpson and John Mayer have split, sources close to the couple have confirmed. Mayer, 29, was the one who reportedly pulled the plug on the pairs 9-month-long relationship this past weekend. The couple last stepped out together at the Costume Institute Gala in NYC earlier this month. Jessica , 26, was last spotted at the Nike party on Thursday night in Cannes, France. Halfway around the world, rumored ex-beau John Mayer partied through the wee hours of the night at NYCs Stereo nightclub, where DJ AM was spinning. Mayer stood sandwiched between club owner Michael Satsky and comedian Sherrod Small most of the night, chatting occasionally with one brunette lady friend. He looked extremely happy partying like he was single, said one Stereo clubgoer. And there was one woman who looked overly friendly.