Born as Jessica Ellen Cornish, stagename Jessie J is an English singer and songwriter. Jessie has written songs for Justin Timberlake, Alicia Keys and Christina Aguilera and also also co-wrote the song "Party in the U.S.A." for Miley Cyrus. She was also the supporting singer for Cyndi Lauper during her tour. Jessie J's first song released was Do It Like A Dude. In 2010 she won both Brit Awards for Critic's Choice and BBC named her winner of Sound of 2011.