Sarah Palin may have had a beef with Levi Johnston for painting an unflattering picture of her family in the media, but she admits that his choice to do "porn" is "kind of heartbreaking."

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Palin, 45, says on Monday's "Oprah" that she's disappointed Johnston, 19, decided to bare all in an upcoming Playgirl pictorial, which she dubs pornography.

"I believe he goes by the name Ricky Hollywood now," Palin says, adding that he hasn't been present lately to care for baby Tripp, his baby with Palin's daughter Bristol, 18.

"He's quite busy with the media tours... that's Levi's gig right now," says Palin, who is promoting her new book, Going Rogue, which hits stores Tuesday.

Still, Sarah says Bristol is "doing an amazing job" mothering Tripp while going to college and working. She's also setting an example for young girls and proving "there are consequences to unprotected sex. She is saying, 'Girls, wait.'"

Check out photos of Palin since the Presidential election

The one-time Republican VP hopeful says McCain's camp didn't let her address the news of her daughter's pregnancy as she would have liked during the campaign.

"This is not to be glamorized," Palin explains. "This is not to be emulated... I didn't want that message getting out there that we were giddy happy to become grandparents."

Despite the drama with Johnston, Palin concedes that the teenager will always be a part of her grandson's life -- and therefore hers. Johnston will "forever be the father of this beautiful baby," Palin says.