Leon "Roccstar" Youngblood Jr. (born October 31, 1989) is an American music producer, songwriter, recording artist and rapper. Youngblood has written and produced songs for artists such as Chris Brown, Post Malone, Usher, Rita Ora, Fergie, Prince Royce, Kendrick Lamar, J.Lo, and Melissa Etheridge. He wrote and produced a number of tracks on Chris Brown's album X, which was nominated for Best Urban Contemporary Album Grammy Award in 2014. The Fifty Shades of Grey soundtrack, which featured Youngblood's song "Rude", was also nominated for a Grammy for best soundtrack in December 2015.