Christina Aguilera is all untied in high heels from her terrace, both freeing herself from the pressures of life and literally keeping her sweatpants strings untied. The 40-year-old singing superstar made it all bombshell curves for her 7.4 million Instagram followers today, ensuring Hump Day was wow day. The "Stripped" hit-maker's mid-week post was a gorgeous sun-drenched shot taking the Grammy winner in full-length and wowing the fans. Christina was striking a mean gaze, and her on-trend look was rivaling the 20-somethings on Depop.