"Oh kittens! It's two pseudo famous people sitting next to each other… doesn't mean we were bumping uglies!" she wrote on her Web site. "You know I don't just do that with anyone! That's just how the media works, as you can tell."
Katy, who earlier this year vowed to remain celibate after splitting with longtime beau, Gym Class Heroes frontman Travis McCoy, over New Year's, said she was in Vegas, not with Benji on a solo date, but hanging with a host of friends.
"I was there celebrating a really fun show and a boozy Valentine's with all my good friends. We were like a group of 25," she wrote.
The "I Kissed A Girl" singer did note, however, that she has a fondness for the guitarist, who recently broke up with Paris Hilton.
"Benji is a nice young fellow, but my heart really belongs to Kitty Purry," she wrote, referring to her cat.
Related Content from AccessHollywood.com:
VIEW THE PHOTOS: Pop Stars
PLAY IT NOW: Music Video: Katy Perry 'Thinking Of You'
PLAY IT NOW: Music Video: Katy Perry 'Hot N Cold'