Credit: Todd Williamson/; Jim Spellman/

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.

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Earlier this week, she claimed they were just friends.

But over the weekend, the two seemed more like friends -- with benefits.

As 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."