Nikki Sixx, the bassist for the iconic Sunset Strip rock band Mötley Crüe, has confirmed that he's engaged to his longtime girlfriend, Courtney Bingham.

Sixx and Bingham had reportedly been dating for two years before the 53-year-old rock star proposed to the 27-year-old supermodel during a vacation to St. Barts this past weekend.

The couple posed for an engagement photo outside their home in Calabasas, Calif., where Sixx held on tight to his bride-to-be as she put her new engagement ring on display.

TMZ reports that the musician showed his affection for his supermodel fiancée with a 6-carat diamond engagement ring.

This will be Sixx's third trip down the aisle. He was previously married to Playboy Playmate Brandi Bandt, with whom he has three children. The two were married from May 1989 to November 1996.

Sixx also has one daughter with actress/Playboy Playmate Donna D'Errico, to whom he was married from December 1996 to June 2007.

Sixx is widely recognized as the co-founder and bassist for Mötley Crüe. The band, which has been described as one of the world’s most notorious rock bands, has sold more than 80 million albums worldwide, including 25 million in the U.S. alone.

In 2007, Sixx published "The Heroin Diaries: A Year in the Life of a Shattered Rock Star." The book is a 413-page collection of diary entries written between Christmas 1986 and Christmas 1987, and it chronicles the recording of Mötley Crüe's “Girls, Girls, Girls” album, along with the subsequent “Girls Girls Girls” tour. It ends with Sixx's near-death from a heroin overdose in late 1987, which inspires the band to quit heroin altogether.