Article continues below advertisementRihanna is looking back on her pregnancy with a rare photo of her baby bump.The singer, 37, bared her pregnant belly in a green bikini from a vacation to Barbados in a Sunday, November 30, Instagram post.Rihanna turned to the side and flaunted her curves in a tiny top, thong and matching sunglasses. She accessorized with a thick ring and bangles as her long hair cascaded behind her in loose waves.Article continues below advertisementSource: @badgalriri/InstagramRihanna gave birth to her daughter, Rocki, in September.