Levi Johnston‘s 18 year-old sister has gone nude for a four-page nude pictorial for Playboy magazine. Mercede’s issue will hit newsstands on August 12. Anyone excited?

Levi famously took it off, and now his opportunist sister is doing the same. Levi’s issue was hyped for months, with Levi appearing on television shows to tease us about whether or not he would show his peen. I guess 18 year-old Mercede’s just couldn’t wait to pose! Will she show more skin than her brother did? Heidi Montag was pretty covered up in her Playboy spread, so you never know.

Mercede and Bristol Palin do not get along. Bristol claims that Levi “stole” her virginity in a tent, but Mercede didn’t buy it.

Mercede blogged: “After she made those hurtful and indefensible statements in her book about my brother, I decided no matter how uncomfortable I feel talking about this, it is something which I must do.”

Mercede said that Levi loved Bristol: “No one deserves to be accused of such a disgusting and horrendous thing. Especially not my brother who, believe it or not, truly loved Bristol with all of his heart.”

First I was writing about Mercede’s stripping down and now I’m defending Levi? I hate the Palins and I was expecting Bristol to be libelous in her book. He’s the father of the child that she loves and I am shocked that she would hint that he raped her, or “stole” her virginity. Can’t stand Bristol, so I have to side with Mercede, even if she’s nothing but a redneck whore. Hopefully she’ll strip and then just go away.

Photo: Splash via Us Weekly