The 39-year-old who is married with a kid invited Lone Martinsen up on stage and had her pull down her hot pants so he could scribble his signature across her behind in front of 65,000 fans in Gothenburg, Sweden, on his Take The Crown tour.Williams had spotted Martinsen’s homemade saucy sign which asked the singer for his autograph so she could have it tattooed as a permanent reminder of meeting her idol.