Working out does a body good. We spotted Miley Cyrus leaving her Pilates class on Friday - the third time this week!

For a star who was ridiculed not too long ago for putting on a few pounds, she's proved a little exercise can go a long way. Look how skinny she is. Maybe Pilates is the key to burning calories and staying thin.

The singer/actress wore a tight black dress and sneakers. She also carried a colorful gym bag.

She stars in the upcoming film "LOL" opposite Demi Moore. Check out more photos...