Still Shredded at 40 — and She Knows It. Carrie Underwood is proving age really is just a number — and doing it in a tiny bikini that has the internet gasping for air. The country superstar was spotted poolside at a private Las Vegas resort, soaking up the desert sun while taking a quick break from rehearsals for her blockbuster Vegas residency — and her sculpted abs, toned arms, and sun-kissed glow had fans asking one thing: “HOW is this woman 40?!”

Carrie Underwood took to Instagram to show off her bikini body on Sunday.Still Shredded at 40 — and She Knows It. Carrie Underwood is proving age really is just a…