Rihanna increases security after crazed fan mail

Rihanna is reportedly stepping up her personal security after receiving X-rated letters from a crazed fan.

The ‘Rude Boy’ singer is said to be shocked by the graphic fan mail and her rumoured boyfriend, baseball player Matt Kemp, is believed to have stepped in to make sure the obsessed letter writer, who calls himself ‘Buster’, can’t get to her.