Er, maybe sexy isn't the best word, but she definitely got our attention!

Madonna joined Instagram on February 10, and while she started off with a few random concert shots, she later posted two saucy selfies. "Cheers motherf**kers! I'm on instagram," the 54-year-old singer wrote, followed by a snap of her sweaty boobs with the caption, "Addicted to sweat."

As you may know, Madonna and her trainer are launching a workout DVD series by the same name, and she recently said in a statement, "Addicted to Sweat is inspired by my workout regimen that I do consistently to take care of my mind and body. My trainer Nicole and I have created this program that has helped give me the body I have today."