Happy Birthday today (Dec. 11) to Nikki Sixx. The bassist and co-founder of Motley Crue is 57.

Sixx founded Motley Crue with drummer Tommy Lee in 1980, and later would be joined by guitarist Mick Mars and singer Vince Neil. The band released their self-recorded debut Too Fast For Love in 1981 on their own label and would re-release the album after signing with Elektra Records. They released their breakthrough album Shout at The Devil in 1983, followed by Theater of Pain in 1985, Girls, Gilrs, Girls in 1987, and Dr. Feelgood in 1989. Dr. Feelgood would become Motley Crue's most successful album spending 114 weeks on the charts and selling over 6 million copies in the U.S.

The compilation Decade of Decadence was released in 1991. Many other releases would follow with a Farewell tour being announced in January of 2014. The band will play their final show at the Staples Center in Los Angeles on Dec. 31.

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