Oh, those 'Sister, Sister' girls have grown up fast, haven't they? It seems like only yesterday they were on The WB, and today, they're talking about stripping off for a magazine cover -- what would Ray say?

Such is the dilemma facing Tia on this week's 'Tia & Tamera' (Mon., 9PM ET on Style).

She's booked an 'Us Weekly' photo shoot during her pregnancy, but just before she's scheduled to go in front of the camera, her publicist informs her, "if you shoot nude today, they'll put you on the cover." At Tia's shock, she's quick to point out, "Like, Britney Spears and Demi Moore, like that type of nude."

Sure, 'cause Britney's the epitome of tastefulness. (Love you, Brit-Brit!)

It turns out to be a surprisingly easy decision for Tia, once she has her husband's approval, and once they've added some big hair into the mix, she's totally happy with the results. As is husband Cory, for the record.