Well Katrina said Playboy offered her and some of the other girls $250,000 each to do a "Girls of Apprentice" layout, but because she's oh so respectable, she's going to do FHM instead (for free!). :rolleyes
I don't know about anybody else, though.
ETA: Here's a link to an article that mentions the Playboy offer. The rumor is that the girls were offered $250,000, Katrina won't say exactly what the amount was but she does say she turned them down.