This past December, word got out that Madonna had kissed Nicki Minaj, but there wasn't any proof. Now, there is. Nicki tweeted: "OH MY f'ingggg Gahhhh!!!!! MADONNA jus kissed me!!!!! On the lips!!!!!!! It felt sooooo good. Soooo soft!!!! *passes out* aaahhhhh!!!!!!!!!"

Madonna explained the kiss to Anderson Cooper, saying: "It was her birthday and it was actually the end of one of those long days of shooting, and we were all giving a birthday toast to her. After a few sips of champagne, I kissed her!"