Madonna Credit: Instagram

Madonna may be late to the party, but she certainly knows how to make an entrance! The Material Girl officially joined Instagram on Sunday, Feb. 10, and proceeded to share two racy images with fans.

In one picture, the 54-year-old stares seductively into the camera while sipping a martini. "Cheers motherf-ckers!" Madonna, who sports blunt blonde bangs and a lacy black bra, wrote in the caption. "I'm on Instagram."

A second photo focuses on the "Like a Virgin" singer's cleavage after an intense workout. "Addicted to sweat!" Madonna explained.

The famously in-shape singer will soon open her first Hard Candy Fitness center in Rome, Italy. In conjunction with New Evolution Ventures, the three-story, 13,000-square-foot facility will feature studios for yoga and group fitness classes. Instructors will teach the brand's exclusive Addicted to Sweat programs, which are also available on DVD.

"Addicted to Sweat is inspired by my workout regiment that I do consistently to take care of my mind and body," Madonna says. "My trainer Nicole and I have created this program that has helped give me the body I have today."