Like brother, like sister. Levi Johnston's little sis, Mercede Johnston, is reportedly going to be posing for Playboy, just like Levi did for Playgirl. Except that, as RumorFix.com reports, "Mercede will do what her brother didn't -- and show it all!" Mercede is best known for, well, pretty much nothing aside from keeping a blog of outrageous claims about the Palins, including the doozy that, "[Bristol] and Levi were sexually active and trying to conceive a child. As hard as it is for many of you to believe, they were indeed TRYING. It was NOT an accident!" S,o I guess the men of the world are clamoring to see Mercede naked? [Huffington Post] After the jump, other relatives who had no problem stripping down for nude photo shoots. It must be genetic.