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Rex Features
The 49-year-old popstar is the headline act at the event, but wouldn't confirm whether her '4 Minutes' collaborator would be performing a cameo.
She told the BBC: "I don't know if [Justin Timberlake] is going to be there or not. We will see!
"But if he isn't we will have a video projection and will change around the choreography and everything."
Radio 1's Big Weekend takes place at Mote Park, Maidstone, Kent on May 10 and 11. Other artists playing the bash include The Kooks, Nelly, Usher and Duffy.
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