Beautiful Nightmare is the second studio album by British-Australian recording artist Reece Mastin, released on 19 October 2012, by Sony Music Australia. It is the follow-up to Mastin's self-titled debut album, and his first album to be made up of solely original material. In composing the album, Mastin collaborated with several songwriters and producers, including DNA Songs, Benji Madden, Lindsay Rimes, Damon Sharpe, Louis Biancaniello, Brian Howes and Rune Westberg, among others.

Beautiful Nightmare debuted at number three on the Australian ARIA Albums Chart and number two on the New Zealand Albums Chart. The album was preceded by the lead single "Shut Up & Kiss Me" in April 2012, which debuted at number one on the New Zealand Singles Chart and number two on the ARIA Singles Chart. The song was certified platinum by the Australian Recording Industry Association (ARIA), and gold by the Recording Industry Association of New Zealand (RIANZ). The second single "Shout It Out" was released in June 2012, which debuted at number one on the ARIA Singles Chart and was certified platinum. "Rock Star" was released as the album's third single.