Cameron Diaz and P. Diddy were seen "making out like teenagers" during a night out in New York City recently.

The actress and the rapper were seen partying at the Dream Downtown Hotel on Saturday and they were all over each other, according to Life & Style magazine.

The pair have denied that they are "romantically involved" but eyewitness who saw them together beg to differ.

"They were making out like teenagers," an eyewitness told the publication.

Cameron Diaz ended her relationship with Alex Rodriguez earlier this year but is said to have had an on-off relationship with Diddy since 2008.

"Since then, when she's single, she'll booty call him," an insider told US Weekly.

Diddy is reportedly still be dating his protg, singer/model Cassie but is apparently always open to a good time.

"Diddy's single whenever there's a better offer on the table!" a friend of the hip-hop mogul said.

Meanwhile, Cameron's liaisons with Diddy is rumoured to be annoying Jennifer Lopez as the pair have a difficult relationship.

"When Cameron started seeing Diddy, it cut Jen's heart like a knife," a source said. Jennifer had remained friends with the performer since their split in 2001 but Cameron has apparently come between that now.