New year, new drama -- especially when it comes to old celeb feuds. Lily Allen and Katy Perry's drama is heating up -- as if Katy didn't have enough on her plate since her recently blogged about breakup. Katy started the tension between the two singers when she explained herself as "A fatter version of Amy Winehouse and a skinnier version of Lily Allen," which later defended to Us Weekly saying, "Yeah, I made a joke about [that] earlier this year. I was just kind of joking and trying to be funny. Comedians are not necessarily to be taken super seriously."

But Lily wasn't aware that Katy saw herself as a stand-up comic. She is threatening to reveal a super secret detail about Katy's life if KP doesn't stop yapping to the press about her. "I have Katy Perry's number. I'm just waiting for her to open her mouth one more time -- then it hits Facebook." KP better change her digits fast!

Lily's already actively Katy-hating online. She joined the "I hate Katy Perry and her dumb song 'I Kissed A Girl'" and "Katy Perry? Who does she think she is?" groups on Facebook. Where's Travis when you need him!