Former Days of Our Lives soap star Lisa Rinna, who turns 51 this July, is the oldest stunner on our bikini list, and tweeted this sexy pic of herself in a two-piece. Back in 2010, Lisa tweeted a similar bikini pic of herself (she was 47 at the time) after Demi Moore posted her famous pic, paying homage to Demi by adding: “Doin the Demi! Power to the 47yr olds!!!!! She is my idol! :)” To return to her Days of Our Lives role earlier this year, Rinna made sure she looked as good as she did back in 1993 when she first played her role. “I’ve been doing yoga and my body is looking real good right now,” Lisa told the press about maintaining her amazingly stunning figure over the years.