'#willpower' is the fourth studio album by American recording artist and record producer, will.i.am. It was released on April 19, 2013. The album was originally titled 'Black Einstein' and scheduled for release at the end of 2011. It was then renamed '#willpower' and delayed several more times. Eva Simons and Britney Spears respectively feature on the album's first single "This Is Love" and second single "Scream & Shout", while Justin Bieber features on third single "#thatPower". Lil Wayne, Hit-Boy, Diddy and Waka Flocka Flame feature on the remix to "Scream & Shout", whilst Juicy J, Chris Brown, Miley Cyrus, Skylar Grey, Nicole Scherzinger, Korean pop group 2NE1, Baby Kaeley and apl.de.ap also lend their vocals for guest features on the album.