Britney Spears

Britney held the record for the fastest-selling album by a female artist with her 2000 record 'Oops! I Did It Again' until Adele surpassed her with '25' in 2015.

But Britney's not jealous as the '...Baby One More Time' singer thinks of Adele as a "queen"

She said: "I love her, she is the queen! She's amazing, she's brilliant!"