We hardly recognized this singer without her usual vibrant makeup and colorful hair! Do you recognize the fresh-faced high school student in this yearbook picture?

Back when her teachers at Mayfield High School were referring to her as Ms. Cornish, this Brit spent her days dreaming of musical fame instead of keeping her nose buried in books. It's a good thing she went after her dreams, since she's now keeping busy churning out pop hits for all of her fans to enjoy!

Can you guess who it is? Click through to see if you were correct!