Happy Birthday is the fourth mixtape released by British rapper Tinie Tempah. The mixtape was released for free download on December 16, 2011 on Disturbing London Records - featuring production from 3Mindz, S-X, Wizzy Wow and Stargate. The mixtape title is Happy Birthday because the mixtape came into production around Tempah's 23rd birthday (November 7). Tracks "Like It or Love It", "Lucky Cunt" and "Till I'm Gone (Remix)" were leaked prior to the mixtape release to create buzz, with "Like It or Love It" receiving minor radio airplay. Happy Birthday features British rappers Chipmunk, Giggs, Wretch 32, G-Frsh, Tinchy Stryder and Krept and Konan, including a variety of American rappers; Soulja Boy, J. Cole and Big Sean, along with Wiz Khalifa, Pusha T and Jim Jones on the "Till I'm Gone" remix (originally released on August 29, 2011). British vocalist J. Warner also makes a guest appearance.

On professional mixtape download site Datpiff, Happy Birthday has been downloaded over 30,000 times.

A music video for "You Know What" was published to YouTube on March 3, 2012. It was directed by Jabari Johnson and features Tinie Tempah rapping in a dark room.

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