Madonna Shows Nipples With '80s Throwback Look at 2014 Black Ball, Hangs Out With More Music Royalty—See Photos!

Alicia Keys, who was also there, is a co-founder of the charity organization, which helps African children with HIV and AIDS and their families

Madonna went full Throwback Thursday with a NSFW look and was joined by fellow music royalty at the 2014 Black Ball, hosted by the Keep a Child Alive charity.

The 56-year-old Queen of Pop wore a black, semi-sheer lace corset dress that showed some serious cleavage...and left little to the imagination, as well as a crucifix pendant, channeling a mashup of looks she sported in her '80s music videos "Like a Virgin" and "Like a Prayer." She paired the look with thigh-high Givenchy boots.

The label's artistic director, Riccardo Tisci, was honored at the event, held at the Hammerstein Ballroom in New York City on Thursday, with the KCA Humanitarian Award for "inspiring new and compassionate ways of thinking through his bold and unapologetic voice in challenging discrimination, while breaking cultural barriers in the fashion industry." He and Givenchy are longtime supporters of Keep a Child Alive.

They were joined by hip-hop star Kanye West, 37, Queen of Soul Aretha Franklin, 72, Sean "Diddy" Combs, 44, and Alicia Keys. The latter artists performed at the event, as did rapper Nas, 41. Keys is the co-founder of Keep a Child Alive, which helps children with HIV and AIDS.

Tisci posted on his Instagram page a photo of Madonna lying on the floor at the event, saying. "QUEEN M IN THE HOUSE," Tisci said on Instagram. "@madonna @givenchyofficial#love #foreveryoung #family #gang

Madonna shared the same pic.

"These Givenchy boots tho............#unapologeticbitch," she said.

A photo posted by riccardotisci17 (@riccardotisci17) on Oct 10, 2014 at 7:29pm PDT

Madonna also shared on her Instagram page photos of herself posing with West and Keys, who is pregnant.

"G*D Bless this Girl!" Madonna said about Keys. "Beauitful and Generous!@aliciakeyes #blackball #livingforlove."

Keys, 33, was accompanied husband Swizz Beatz. The 36-year-old hip-hop star posted a photo of his wife performing onstage.

Let the light glow ??????????????????????????????????????????????????????

A photo posted by therealswizzz (@therealswizzz) on Oct 10, 2014 at 9:50pm PDT

Keys is pregnant with their second child and is due to give birth on Dec. 31. The two are parents to a son, Egypt Daoud Ibarr Dean, who turned 4 last week.

At the event, Keys got to hang out with Franklin.

Combs posted on his Instagram page a pic of himself with Swizz, West and Tisci.

"Last night was mad real!" Combs said. "#Ye @therealswizzz@riccardotisci17 @iamdiddy #BLACKBALL #cirocLife." 

A photo posted by Sean Diddy Combs (@iamdiddy) on Oct 10, 2014 at 3:05am PDT

Combs also shared on his Instagram page a photo of himself with Madonna.

"#aboutLastNight @madonna #BLACKBALL #royalty," he said.