Robbie Williams signs fan`s bottom

London: Singer Robbie Williams has signed a fan`s butt after he spotted her poster, which begged him for his signature.

The poster by the fan, whose name is Lone Martinsen, read: "Please sign my butt so I can tattoo it."

The 39-year-old singer then pulled her up on the stage, while he was performing to a crowd of 65,000 fans as part of his ‘Take The Crown’ tour, and obliged her, reports