Britney Spears (in-universe)

Britney Spears was a 21st century human singer. Her song "Toxic", a "traditional ballad," was played on Lady Cassandra's "iPod". (TV: The End of the World)

Irving Braxiatel once asked Jason Kane to buy him some Britney Spears CDs while on a trip to Earth in the 21st century. (PROSE: A Mutual Friend)

Invalid appearances
Eddie Redmayne once called Britney on the phone to ask her if she knew where Pudsey was. (NOTVALID: Looking for Pudsey)

Britney Spears