June 21, 2012 at 11:13 AM ET
Bristol Palin and her fiance are waiting to have sex until after they're married, the star of reality show "Life's a Tripp" told InTouch Weekly.
Palin, daughter of former Alaska governor and vice-presidential candidate Sarah Palin, became pregnant with son Tripp at age 17, but now says she's learned her lesson.
"I'm doing what's best for me," she told the magazine. "It's between me and God, and I know it's right."
Palin is engaged to wed pipeline worker Giacinto Paoletti, also 21. She previously broke off two separate engagements to Tripp's father, Levi Johnston.
She also tells the magazine that the life of a teen mom is difficult, and she's only fully realizing that now.
"My sister Willow is 17, and when I was her age, I was eight months pregnant, and I look at her and I think, ‘Holy cow, I was just a baby!’ ” she told the magazine. "I want to let girls know that this isn't ideal, this isn't fun, this isn't easy."