McKee started young as a musician, at first concentrating on her piano skills, before becoming an artist and then ultimately concentrating on her songwriting. Success really started to bite when in 2009 she hooked up with Dr Luke, and he enabled a majorly fruitful relationship to develop with Katy Perry in the creation of her music. Three of their songs together on Perrys third album, California Gurls, Teenage Dream and Last Friday Night topped the US singles chart. Major global success continued for McKee alongside Taio Cruz, Flo Rida, Rita Ora, Jason Derulo and Britney Spears, alongside more hits with Katy Perry including the trans-atlantic Number 1 single Roar which was also nominated for a Grammy for Song of the Year in 2013.