AceShowbiz -

Not yet commenting on their much-talked romance, new celebrity couple Paris Hilton and Benji Madden have become even closer to one another and most of all seem to be inseparable. The supposed lovers, though said nothing about the dating rumors, have stepped out as a couple.

"Yes, they are dating. It's pretty serious," a source told People of the couple who in fact have been spotted holding hands at some occasions. In addition to their being spotted hooking up on February 21, while partying at Villa nightclub in L.A., they were spotted together again, traveled to Missouri this past weekend for one of Benji's DJ gigs.

Then again, Paris and Benji were caught at Pets of Bel Air on Monday afternoon, February 25. They also ate lunch at a nearby restaurant with Benji's mom.

The twosome, as reported by People, hit the Polo Lounge at the Beverly Hills Hotel on Sunday night, February 24 "where they cuddled in a massive booth and engaged in an intimate conversation." On top of all, a picture of Paris and Benji has been posted on the Madden brothers Website, which they call a "nice little family photo," describing Paris as the "wonderful Paris."

Romance rumors of Paris and Benji came to the surface hot on the heels of the official confirmation that the Good Charlotte member ended his longtime relationship with fiancee Sophie Monk.