Justin Timberlake made a few thinly disguised digs about his ex Britney Spears whilst introducing Madonna at the Rock and Roll Hall Of Fame ceremony last night in New York. Timberlake has collaborated with Madonna on her new album, Hard Candy, and features on the upcoming first single 4 Seconds to Save The World. During his speech he really stirred things up by saying, "The world has always been full of Madonna wannabes and I might have even dated a couple." Whilst he was paying tribute to Madge's amazing career he made it pretty clear who he was referrring to, by cheekily saying, "She [Madona] has still found time to kiss someone I may or may not have publicly kissed myself," before joking, "Of course you know I was talking about Sean Penn." It seems that the feelings for Britney that Justin first aired in his notorious video for Cry Me A River are still as strong as ever.