Jesse James and Kat Von D went public with their relationship last night, holding hands and posing together at the opening of a gallery in Hollywood.

Kat Von D, 28, doesn’t care if anyone else gets why she’s dating the recently divorced father of three.

“I think I learned a long time ago, even before the show, that it really doesn’t matter in the big picture [what anyone thinks],” she told UsMagazine.com. ” All that stuff isn’t important. I want to lead by example and do my best.”

Asked if she’s happy, she said, “Yes.”

She previously said that she first met James when she was 22 — when he had a program on the Discovery Channel — before things got romantic this summer.

“I think it was something that was spontaneous,” she told Us. “It definitely wasn’t planned.”

She’s been to his new home in Austin, Tx — where James’ ex Bullock, 46, also owns a home — and has met his kids, Chandler, 15, Jesse Jr., 12, and Sunny, 6.

“Jesse took me to a really neat antique shop,” Von D told Us. “So we went in and hung out. I got an old drawing, engraving Beethoven.”

Asked if James was involved in her gallery, she said, “Yeah, were together. Duh.”

Tags: Jesse James, Kat Von D