Rapper T-Pain has given Britney Spears a huge boost after going public with praise for the troubled pop star. T-Pain has revealed he has been working with Spears on her comeback album - and he's more than impressed with the singer's talents. He tells MTV News, "She came in, shook my hand and went right into the booth. "She was smiling the whole time. In an hour we had a song... She was about her business. "I sang it first and she sung over what I did... in key and everything!"