The actress sparked pregnancy rumours when she was snapped looking a little curvier than usual in a bikini last November.
She arrived at the Nickelodeon Kids' Choice Awards in Los Angeles on Saturday wearing a maternity-style dress, suggesting she was hiding a bump.
But a representative for the Ghost Whisperer star denies the claims, telling People: ‘She is not pregnant’.
Jennifer, 29, is engaged to Scottish actor Ross McCall, 32.
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