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The twosome were "holding hands the whole time" during their visit, an eyewitness tells UsMagazine.com -- and more.

PHOTOS: Other tattooed stars

The observer says that James, 41, and von D, 28, "shared a passionate kiss" while checking out the "circulatory room" of the exhibit. Says the witness: James "stood behind her and was hugging her from behind."

Has Jesse James found romance again -- with another tattooed woman?

In Las Vegas On Sunday, the motorcycle mogul checked out "BODIES: The Exhibition" at the Luxor Hotel & Casino. His companion: Kat von D, the tattoo artist and star of TLC's L.A. Ink.

Von D (real name: Katherine von Drachenberg) evidently had a great time. Before exiting the gift shop, she signed the guest book, writing,Moncler, "Completely mind-blowing!"

PHOTOS: Meet Jesse's most famous mistress, Michelle McGee

Back in May, Kat defended McGee and other tattooed women to Us. "You can't judge a book by its cover,Louis Vuitton," she told Us at a May 1 event in Beverly Hills.  "I think there has always been a negative stigma surrounding tattoos, especially on women," continued the reality star, who recently split from Motley Crue rocker Nikki Sixx.

Despite this and other reported sightings of the affectionate pair in Vegas and West Hollywood over the weekend, von D's rep tells Us, "They're just friends -- that's all."

PHOTOS: Look back on Jesse and Sandra Bullock's romance

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James' five-year marriage to Sandra Bullock famously imploded after his affair with Michelle "Bombshell" McGee, a tattooed stripper, came to light.

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