Rihanna receives a grahic fan mail and beef up on security……

Some of Rihanna’s fans are as Rated R as her latest album. The pop songstress is said to be shocked by some graphic fan mail she received recently, and her rumored boyfriend Matt Kemp has reportedly stepped in to make sure the letter writer, who calls himself “Buster,” can’t get to her.

A source told the Daily Star newspaper: “Matt has asked Rihanna’s team to be extra cautious since she was sent two very steamy letters. Her friends are also concerned about the situation. They spent a long time talking about it when they dined at the Spanish Kitchen in West Hollywood last week. They are really worried things with this guy are going to get out of hand.”

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Source: Bang Showbiz