The 'I Kissed a Girl' singer, who is happily dating Russell Brand, took to her Twitter account to deny rumors of a hookup between the two.
"Read a bunch of yesterday's news. People should know by now that I don't do vampires," she tweeted.
The hookup rumors started when Katy and Rob were spotted in a car together after having hung out at a karaoke bar where they were celebrating the birthday of a mutual friend, Shannon Woodward.
But of course anytime Rob is seen with anyone, the rumors start to swirl. Guess Katy's the only one that minds making headlines with Rob!