Madonna Shows Off Her Guns After Pilates

On Friday Madonna made her daily trek to Pilates in Beverly Hills, and the 55-year-old pop superstar showed off her impressive biceps and flashed us a smile after her workout.

But here's something interesting than veiny and muscular arms on a 50something woman -- the fact that she's going to collaborate with Avicii on some new tunes! And of course, Madge took the opportunity to post a sexy photo on Instagram when she announced the news.

Lady M uploaded the pic below and wrote, "Doing some house work after 4 hours of sleep which is why i cant spell! On my way to the studio to work with Avicii! #clean."



She would do house work in an outfit like this...