“All in My Head (Flex)” is the second single by American singing group Fifth Harmony, from their second studio album, 7/27, which was released on May 27, 2016. The song was written by Mikkel Eriksen, Tor Hermansen, Benjamin Levin, Willie Maxwell, Daystar Peterson, Nolan Lambroza, Julia Michaels, Simon Wilcox, Brian Garcia, Ewart Brown, Clifton Dillon, Richard Foulks, Herbert Harris, Leroy Romans, Lowell Dunbar, Brian Thompson & Handel Tucker and produced by Stargate, Benny Blanco & Sir Nolan. It features hip hop recording artist Fetty Wap.

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