Justin Timberlake Rips Britney, Introduces Madonna

Justin Timberlake couldn't pass up a few shots at former flame Britney Spears when honoring Madonna at the Rock and Roll Hall of Fame ceremony Monday.

"The world has always been full of Madonna wannabes," Timberlake said, introducing the Material Girl. "I might have even dated a couple."

The biggest-selling female artist in history, Madonna was formally inducted into Hall of Fame at a dinner at the Waldorf Astoria Hotel in New York.

Justin Timberlake had the honor of recognizing Madonna before she made her own  speech. He made another Britney Spears crack as he concluded ...

"She has still found time to kiss someone I may or may not have publicly kissed myself while I was in the audience," Timberlake said of Madonna.

"Of course, you know, I was talking about Sean Penn."

Justin Timberlake introduced Rock and Roll Hall of Famer Madonna last night.

The 49-year-old pop star strode on stage, thanking Justin Timberlake - and some of the people who had helped her career, as well as her family and fans.

Madonna gave a raucous acceptance speech that included calling the audience "motherf*%$ers" and sharing sordid tales about her life in music.

She gleefully recalled when she met her long-time publicist Liz Rosenberg. She was "smoking a joint," Madonna said. She also told the crowd she split a tab of ecstasy with a music exec who she gave her first demo tape to.

Madonna then mimicked Michael Jackson in a squeaky voice, describing how she went after and stole Jackson's manager. Naturally.