Jessica Simpson shared a revealing photo of herself on vacation in Hawaii yesterday. Clad in a cowboy hat, red bikini, and red caftan, pregnant Jessica Simpson smiled for the camera. She posted the image on Twitter with the caption, "Fun in the sun." Her sister, Ashlee, was outside also, spending time at the beach with her son, Bronx, and mom, Tina. Ashlee showed a bit of skin as well with her t-shirt knotted at the waist. Later in the day, Ashlee and Tina broke from sunbathing to pick up supplies in town. Ashlee, Bronx, and Tina are enjoying a Christmas getaway with Jessica, her daughter, Maxwell, and fiancé, Eric Johnson. Jessica hasn't been photographed in her two-piece by the shore just yet, but Jessica and Eric did hold hands for a romantic beach walk the day after Christmas.