Nikki Sixx (born Frank Carlton Serafino Feranna Jr.; December 11, 1958) is an American musician, best known as the co-founder, bassist, and primary songwriter of the heavy metal band Mötley Crüe, being the only member to remain throughout their entire history.Prior to forming Mötley Crüe, he 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, Diet for a New America. Also in 2002, he formed the hard rock supergroup Brides of Destruction with L.A. Guns guitarist Tracii Guns.
His side band Sixx:A.M. was 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, which featured songwriter, producer, and vocalist James Michael and guitarist DJ Ashba.
He launched the clothing line "Royal Underground" in 2006 with Kelly Gray, formerly the co-president and house model of St. John. 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 was married to his first wife, Playboy Playmate Brandi Brandt from May 1989 to November 1996; they have three children: Gunner Nicholas Sixx (born January 25, 1991), Storm Brieann Sixx (born April 14, 1994), and Decker Nilsson Sixx (born May 23, 1995). One month after the divorce from Brandt, he married his second wife, actress and Playmate of the Month for September 1995, Donna D'Errico; they have one daughter, Frankie-Jean Mary Sixx (born January 2, 2001). They separated twice and divorced in June 2007.
He dated tattoo artist Kat Von D from 2008 to 2010. He then married his third wife, Courtney Binghamton on March 15, 2014; they have a daughter Ruby Sixx (born July 27, 2019).

Mötley Crüe | Hellfest 2023
Self
2023

The Dirt
Self (archive footage) (uncredited)
2019

The Launch
Self - Mentor · (1 episode)
2018

Cum On Feel The Noize
Self
2017

The Rise And Rise of Motley Crue
Self (archive footage)

30 Years of Mötley Crüe: XXX Girls Girls Girls
Self
2017
Graspop Metal Meeting 2016 Compilation
Self [Sixx A.M.]
2016

Mötley Crüe: The End - Live in Los Angeles
Self
2016

It's So Easy and Other Lies
Self
2016

Mötley Crüe | Rock in Rio 2015
Self
2015

The Life, Blood and Rhythm of Randy Castillo
Self
2014

Slash: Raised On the Sunset Strip
Self
2014

Mötley Crüe | Live Side
Self
2012

Ozzy Osbourne: Thirty Years After The Blizzard
Self
2011

Lemmy
Self
2010

Mötley Crüe | The Spirit Of Buenos Aires
Self
2009

Mötley Crüe | Crüe Fest 2008
Self
2009

LA Ink
Self · (5 episodes)
2007

Disaster!
Self [Motley Crue] (voice)
2005

Mötley Crüe | Carnival of Sins
Self
2005

Bones
Self · (1 episode)
2005

Mötley Crüe | Greatest Video Hits
Self [Mötley Crüe]
2003

When Rock Ruled the World
Self
2002

Mötley Crüe | Lewd, Crued & Tattooed
Self
2001

Hellraisers
Self (archive footage)
2000

Mötley Crüe | Behind The Music
Self
1998

Motley Crue: Decade of Decadence '81-'91
1992

Moscow Music Peace Festival
Self [Mötley Crüe]
1989

Mötley Crüe | Girls Girls Girls Tour '87/'88
Self
1987

Mötley Crüe | Uncensored
Self
1986

MTV Video Music Awards
Self · (1 episode)
1984

Mötley Crüe | Quebec City 1984
Self
1984

Mötley Crüe: The US Festival '83
1983