On Monday night at the Met Gala, Madonna did what Madonna does best: created controversy by flashing her bottom in a Givenchy lace ensemble.Now the 57-year-old has responded to those who immediately took to social media saying that a woman her age should "put it away", by claiming that her outfit was actually a political statement about how society wants older women to be invisible.Within minutes of Madonna stepping on the red carpet Twitter was flooded with comments criticising the singer for showing so much skin.Piers Morgan tweeted "put it away", and another user wrote "You need people in your life who will tell you the truth, otherwise you'll end up like Madonna."But ever the professional when it comes to owning her controversial statements, Madonna has fought back, saying the reaction has been "proof that we still live in an ageist and sexist society"."We have fought and continue to fight for civil rights and gay rights around the world," she wrote on Instagram. "When it comes to women's rights we are still in the dark ages. My dress at the Met Ball was a political statement as well as a fashion statement."She goes on to say that society is still afraid of older women embracing their bodies - and refusing to be invisible."The fact that people actually believe a woman is not allowed to express her sexuality and be adventurous past a certain age is proof that we still live in an ageist and sexist society."I have never thought in a limited way and I'm not going to start. We cannot effect change unless we are willing to take risks."As such, Madonna believes that Riccardo Tisci's dress has the ability to advance the feminist cause. "By being fearless and by taking the road less travelled. That's how we change history," she continued...