British Pop Singer LEONA LEWIS Shows Off Her BRAND NEW NOSE . . . And She Looks . . . Like A Whole NEW PERSON!!

British singer Leona Lewis was at the top of the game three years ago. But her career has since fizzled.

She's since been upstaged by fellow British star Adele - who is now one of the biggest singers in the world.

It was time for a change for Leona - and what a change. Peep her new nose.

Leona won the third series of The X Factor (U.K. version) in 2006, winning a million dollar recording contract with Simon Cowell's record label, Syco Music. She had one lead single we can name off the top of our heads, "Bleeding Love."