It's not a definite yes, but it's not an outright no either. Despite rumors that Brooke Hogan will be posing for Playboy, there is still not a definite answer. The New York Daily News said:
"Brooke Hogan has been approached to pose nude for the famous men’s magazine — and she didn’t say no. The “Brooke Hogan Knows Best” star, 20, could use a boost for her stagnant career. Brooke has posed for [FHM] in the past, but has never posed nude."
At least if she poses for Playboy we can right out call it porn, instead of a "singing career."