Troubled singer Britney Spears has denied reports she is to make a cameo appearance on children's TV show Sesame Street. Spears, 26, was rumoured to have agreed to appear on the show - a move which would see her sing a clean version of her hit track Toxic on the kids' series. But a spokeswoman for Sesame Street has the dismissed reports. She says,"There are no plans to have Britney on the show. We are not even in production right now."