Katy Perry John Mayer break up 2013 opened the door to the Twilight vampire Robert Pattinson. According to published reports, Mayer has been warding off the vampire advances and “vowed to win back Katy Perry after fearing she had moved on with Rob.”

Katy Perry and John Mayer break up and get back together a lot this year. Katy Perry was spotted at John Mayer’s sunny Fourth of July show in Philadelphia. But when the sun goes down, the blues guitarist worries about vampires.

The blues is built on a legend of selling souls at the crossroads for that perfect blues lick, but when Katy Perry stepped out on John Mayer with Twilight star Robert Pattinson, Mayer had to battle more than blues demons. Mayer realized he had to change his ways to keep the “California Girl” safe from the bloodsucking heartthrob, who was also newly single after he split up with Kristen Stewart in May. Pattinson and Perry went out several times including a concert by Bjork.

Out came the crosses and strands of garlic. Insiders said Mayer didn’t want to lose Perry to another man. A source told the media that "John couldn't stand seeing Katy with someone else. He started texting her and sending flowers. He didn't want her to move on."

Katy told U.S. Vogue magazine, "I was madly in love with him. I still am madly in love with him. All I can say about that relationship is that he's got a beautiful mind. Beautiful mind, tortured soul. I do have to figure out why I am attracted to these broken birds."

The vampire Rob Pattinson felt Katy Perry's mind games like a stake through the heart. A source told Heat magazine, "He's gone through so much with Kristen cheating on him, then taking her back, then splitting up again. It seems cruel to play games with him. He never thought that it was serious with Katy, but it's not great that it looks like he was being two-timed again. Even though Rob and Katy were never that serious, John thought he had competition. Katy knew he was the kind of guy that wants what he can't have and playing him off against Rob drove him crazy. He wanted her even more."