Katy Perry is done kissing Travis McCoy. The “I Kissed a Girl” singer and the Gym Class Heroes frontman split after their holiday trip to Mexico and rang in the New Year apart.

“It’s a hardship, but she’s regrouping,” a source told Celebuzz.

On New Year’s Eve, Perry performed at the Gridlock New Year’s Eve party on the Paramount lot.

“She hung out with her friends all night. She was in a great mood,” says a partygoer. “Nothing seemed out of the ordinary.

That same night, however, McCoy posted on his FriendsorEnemies.com blog the lyrics to “Looking at the Front Door,” a breakup song by hip-hop group Main Source.

The lyrics include: “We fight every night, now that’s not kosher/I reminisce with bliss of when we was closer/And wake up to be greeted by an argument again/You act like you’re ten.”

He then wrote: “My Laptop is my new b-. LOYAL. LISTENS. and NEVER LET’S ME DOWN.”

The two have been off and on for more than a year but got serious last summer while touring together on the Vans Warped Tour.