Jessica Simpson will have a hard time denying reports that she's fallen for singer John Mayer, especially after the two were caught in a "full-on making out" session as they rang in 2007.

The couple has been denying that they are an item since August 2006 when reports first started circulating that the two were seeing each other.

However a source at the Hudson Hotel party thrown by Christina Aguilera said that the Mayer and Simpson didn't leave any guests in doubt that they were a couple.

"He was scratching her back, they were kissing, it wasn't subtle," the New York Daily News quoted the source, as saying.

An insider revealed that though Mayer was extremely eager to keep their relationship away from the prying eyes of the media, Simpson on the other hand, "doesn't really care" about who knows and who doesn't.

"John has been thrilled that they have been tricking the media, but she doesn't really care. His Christmas present to her was a framed copy of the Us Weekly cover that says 'Dumped: John ditches Jessica,'" the insider said.