A pregnant Rihanna by Leibovitz would be amazing! It'd be sooo US Vogue and perfect for the March 'Body' issue - although if Ri has only just started showing, would it have been done in time? It's hard to tell how big the bump is from the pictures, but I suppose she might have been showing in December... it's probably more likely she'd be on an issue later in the year isn't it.
Now that UK Vogue's schedule has been knocked on by a couple of weeks though, might she land that March cover? It'd be down to the wire, but the March issue is not due out until Feb 22 and the ad copy deadline was Jan 18, so could she have shot a pregnancy cover for them in early Jan? Edward loves her so I could see it happening. She filmed a music video with A$AP last year, so pregnancy announcement + music (an EP maybe?) + Vogue cover all in the next month or so would be a serve.