On Wednesday, Kat von D announced on Twitter that she and Jesse James are an item. "And yes, Jesse and I are dating," she wrote.
She then deleted it.
Earlier this week, she claimed they were just friends.
But over the weekend, the two seemed more like friends -- with benefits.
As UsMagazine.com previously reported, they checked out BODIES: The Exhibition" at the Luxor Hotel & Casino Sunday in Las Vegas, where they held hands.
James, 41, and von D, 28, "shared a passionate kiss" while checking out the "circulatory room" of the exhibit, a witness told Us.
The source said James -- who split from Sandra Bullock earlier this year because he cheated on her -- "stood behind her and was hugging her from behind."