Madonna and Justin Timberlake at awards

Singing star Justin Timberlake inducted Madonna into the Rock and Roll Hall of Fame on Monday night, with a saucy speech that called her a control freak and revealed how the Material Girl once injected him in the backside. The singer also called his troubled ex-girlfriend Britney Spears a Madonna "wannabe" in his cheeky monologue at the ceremony at New York's Waldorf Hotel on Park Avenue. After silencing whooping fans, by shouting, "Shut up, it's not about me tonight," Timberlake -- who produced Madonna's latest album, "Hard Candy" -- said, "People always ask if she is the control freak people say she is. Hell yeah."We had a recording session in London and I wasn't feeling well. She said, 'Would you like a B 12 shot.'"She reached into her handbag, pulled a Ziploc bag of B12 syringes and says, 'Drop 'em.' "I don't know what you say to that, so I dropped my pants. She gave me the shot in my ass. It was one of the greatest days of my life. "That is what Madonna will always be to us. The shot in the ass when we really need it."She's a woman on top and I'm sure she is enjoying that position. "Nobody has got into the rock and roll of fame when they're looking this damn fine." Before welcoming the superstar to the stage, Timberlake found time to poke fun at Britney Spears, cheekily joking: "There have been a lot of wannabes, I may have even dated a couple of them. "She has also kissed someone I may or may not have kissed myself. Of course you know I'm talking about Sean Penn."