energetic onstage performances, and following her 40th birthday this week, she made one fan's night by donning a surprise accessory.Alongside her hot pink bodysuit, which was studded with rhinestones, Carrie wrapped a 40th birthday sash around her torso, with one fan getting very excited in the comments. "I gave you that sash you're wearing and you absolutely made my night!" Carrie Underwood took to the stage in a hot pink bodysuitThe birthday sash wasn't Carrie's only special-occasion attire – she also added a pair of bejeweled jeans for an extra sparkly look, paying homage to the name of her tour, which is appropriately called: "The Denim and Rhinestones Tour."Carrie looked incredibly toned in her on-stage outfit, and it's no surprise that the 40-year-old looks so fabulous - she has her own fitness app, Fit52, and regularly shares insight into her workouts with the app.