‘Poker Face’ singer Lady Gaga’s G-string was exposed during a surprise performance in Las Vegas. Gaga, 25, wore a sheer bodysuit as she performed at a Vegas club and her buttock was visible through the mesh outfit, the Daily Mail reported. And as she belted out her hits, fans reached out to grab the singer’s legs and worship their musical idol. She had made the surprise stop ahead of her scheduled concert at the MGM Grand Hotel and Casino as part of her Monster Ball Tour. Despite starting her show almost an hour late, the Bad Romance singer still received cheers and whistles as she took to the stage in Sin City.