The star of A&E's Pawn Stars is headed to the altar with girlfriend Deanna Burditt, 36, he revealed.
"I'm the happiest guy alive," Harrison, 46, told PEOPLE. "I'm living the dream."
With Harrison by her side, the bride-to-be flashed her new sparkler Saturday at the grand opening of photographer Peter Lik's Las Vegas gallery in Mandalay Bay.
Harrison proposed on Valentine's Day at Aureole restaurant, the site of the couple's first date more than a year ago.
"I didn't really ask her, I told her 'Girl, I'm marrying you,' and then I gave her the ring," he said.
The couple are planning to wed within the next year. It will the third marriage for each.
"It's perfect symmetry," he said. "I've got three boys. She's got three girls. We're basically the Brady Bunch."