madonnaoly111412.jpg She put her rock hard body on display for a good cause!

During her concert at Madison Square Garden on Monday, Madonna did her part to raise money for the victims of Hurricane Sandy by stripping down for cash!

The "Express Yourself" singer asked the crowd to throw money on stage as she removed her top to reveal the words "No Fear" written on her back. As she performed her classic hit "Like A Virgin," the audience threw dollars at the Queen of Pop, who was more than happy to get scantily clad for a good cause.

"If you are going to look at the crack of my a--, you better raise some cash," she told the exuberant crowd.

The 54-year-old was motivated to help after witnessing the devastation firsthand.

"I went down to Rockaway Beach yesterday with my children, and we saw what was going on there, we saw the destruction. It was really sad, but we also saw amazing acts of humanity. People sharing with other people, people working hard, cleaning houses, handing out food, blankets, giving love," she explained onstage.

Madge isn't the only celeb with a big heart! Justin Bieber pledged to donate $1 of all New York concert ticket sales, and Lady Gaga donated a whopping $1 million to the Red Cross.

We wonder how much money The Material Girl raised?!