<p><br /> She's been the subject of "is she, or isn't she" headlines for most of this year. Now Mariah Carey has set off another round of rumours that she might be pregnant.<br /> </p><p><br /> It comes after the singer stepped out in Brazil wearing a maxi dress, then later appeared on stage in a series of outfits which showed off her curves.<br /> </p><p><br /> The star was clearly dealing with some sort of burden. She told fans on Twitter: "Tonite was tuff 4 me 4 personal reasons,but U got me thru!L4L."<br /> </p><p><br /> Mariah's husband Nick Cannon also fuelled the baby speculation. On his radio show, he said:<br /> </p><p><br /> "I've said it before and I'll say it time and time again â" when my wife feels like talking about whatever she wants to talk about, you will hear it directly from her."<br /> </p><p><br /> The pair have made no secret of their desire to start a family since getting married in 2008.<br /> </p>
