John Mayer's career took a slight detour when the crooner swapped his demins and tee for a Borat-style mankini. The 30-year-old singer left little to the imagination as he pranced around the luxury cruise in front of about 3,000 fans. "No one could believe what they were seeing," one onlooker said. "This show fell a little short of sexy time." Mayer, who split from girlfriend Jessica "the omen" Simpson last year, was handed the mankini as he took part in a fan cruise on board the 'Mayercraft Carrier'. As the ship sailed back to Miami from it's weekend trip around the Bahamas, a woman thrust the swimwear into his hands. "John tried the thong on over his trousers but then just decided to go the whole hog," the onlooker said. "He disappeared, came back and dropped his towel. He had everyone in stitches. "He's a little bit scrawny - like Borat - and was pasty white, but none of the women seemed to mind." The singer then went onto entertain fans by performing shirtless for a hoard of fans before showing off his drinking skills at the after party. Pictures: Splash News