Robin Roberts left her fans in awe when she shared a bikini-clad photo showcasing her very impressive six-pack abs. The 65-year-old GMA star has been enjoying a vacation in Brazil with her wife, Amber Laign, and her co-star Sam Champion and his husband, Rubem Robierb. Before their departure back to NYC, Robin shared a sun-soaked snap of herself and Sam on the beach, and while they both looked incredible, Robin’s defined abs left her followers in disbelief. The TV anchor stood on the beach in a monochrome striped bikini, leaning against Sam, who wore swim shorts, with her head towards the sky and her arms in the air. Recommended videoYou may also likeWATCH: Celebrities pull out their best bikini looks Her sculpted physique was impossible to miss, and her fans were quick to praise her stunning appearance. “Damuuuuummmm Robin,” one commented, alongside a fire emoji. A second said: “Robin, you are rocking that [bikini]!!!! Lookin good girl!!” A third added: “Lord have mercy Robin you look so good!” A fourth joked: “That’s like an AB ad!!” Captioning the …