Nikki Sixx (born Frank Carlton Serafino Feranna, Jr.; December 11, 1958) is an American musician, songwriter, radio host, and photographer, best known as the co-founder, bassist, and primary songwriter of the band Mötley Crüe. Prior to forming Mötley Crüe, Sixx was a member of Sister before going on to form London with his Sister bandmate Lizzie Grey. In 2000 he formed side project group 58 with Dave Darling, Steve Gibb and Bucket Baker issuing one album, titled Diet for a New America, the same year while in 2002 he formed the hard rock supergroup Brides of Destruction with L.A. Guns guitarist Tracii Guns. Formed in 2006, initially to record an audio accompaniment to Sixx's autobiography The Heroin Diaries: A Year in the Life of a Shattered Rock Star, his side band Sixx:A.M. features songwriter, producer, and vocalist James Michael and guitarist DJ Ashba.Sixx has also worked with a number of artists and groups, co-writing and/or producing songs, such as Sex Pistols's guitarist Steve Jones, Lita Ford, Alice Cooper, Meat Loaf, Marion Raven, Drowning Pool, Saliva and The Last Vegas, among others.
Sixx launched the clothing line "Royal Underground" in 2006 with Kelly Gray, formerly the co-president and house model of St. John. Initially the label concentrated on men's clothing before expanding into women's while in 2010, Premiere Radio Networks launched nationally syndicated Rock/alternative music radio programs "Sixx Sense" and "The Side Show Countdown" with both based in Dallas, Texas and hosted by Sixx and co-hosted by Jenn Marino.
He is also known as Frank Carlton Serafino Feranna Jr. and ANikki Sixx.