"You Haven't Seen the Last of Me" is a song performed by American singer-actress Cher, taken from the soundtrack Burlesque: Original Motion Picture Soundtrack of the accompanying film Burlesque. From Wikipedia
Aguilera pays homage to Cher with a meticulously recreated iconic black leather leotard from the 2010 movie "Burlesque" they starred in together, generating a buzz among fans and co-stars on social media.