The 24-year-old Twilight actor is being followed by a Japanese fan and a group of women, according to the Daily Star, and hopes that the body double will act as a good decoy.
An insider told the newspaper, 'He's become the focus of an overzealous group of female fans.
'Robert is constantly inundated with fan mail but one group of four girls have been targeting him repeatedly, telling him they want to do rude, saucy things to him. One girl from Japan has started turning up wherever he is.
'She's X-rated and repeatedly threatens him with kinky perverse phrases. It's quite shocking.
'Robert thinks there's only one thing for it and that is to increase his security and use a body double.
'It may seem a bit extreme, but at least now he can be in two countries at once and spend some quality time with Kristen.'