"Life is too short not to be with the person you want to be with," she says of her marriage plans with the Australian actor, with whom she fell in love while making 2009's The Last Song. And, the Hannah Montana star points out, don't expect the twosome to actually walk down the aisle anytime soon.
"I don't really care about the wedding or the piece of paper as much as I do the promise we've made to each other," she says. "And we want to have a long engagement."
Why do she and her Hunger Games hunk work? "Liam and I have a really good relationship," the "Can't Be Tamed" singer explains. "Neither of us is super-jealous. We know each other and would never do anything to hurt each other."