Cheryl Cole
From Tardis Wiki, the free Doctor Who reference
Cheryl was a famous singer in the 21st century.
Clyde Langer's friend Steve Wallace mentioned Cheryl, and said when he was famous, he would tell Cheryl about Clyde, but quickly changed his mind when Clyde's curse affected him and made him aggressive towards Clyde. (TV: The Curse of Clyde Langer)
Rani Chandra watched Cheryl's "Fight For This Love" music video on YouTube. (AUDIO: Deadly Download)
Behind the scenes
Only Cheryl's first name is given in TV: The Curse of Clyde Langer.