Nikki Sixx's girlfriend Courtney Bingham treated the MÖTLEY CRÜE/SIXX: A.M. bassist and CRÜE's fans to a special burlesque show during last night's (Thursday, September 6) concert at DTE Energy Music Theater in Clarkson, Michigan.

Bingham celebrated her 27th birthday by performing a striptease to the MÖTLEY CRÜE song "Girls, Girls, Girls".

Fan-filmed video footage of her appearance can be seen below.

After the show, Sixx said in an online posting, "It was a blast for me watching Courtney get all excited to dance on stage with our background dancers for her birthday. She really kicked ass, too."

Sixx and Bingham have been dating since 2010, shortly after the breakup of his relationship with tattoo artist Kat Von D.

In his autobiography, "Tattoos & Tequila: To Hell and Back with One of Rock's Most Notorious Frontmen", MÖTLEY CRÜE singer Vince Neil took aim at Sixx for his dating habits, writing, "Just like Tommy [Lee, MÖTLEY CRÜE drummer], [Nikki's] another one of those guys who just love the whole fame thing. He wouldn't have been with the tattoo artist Kat Von D if she wasn't famous. And [former 'Baywatch' actress] Donna D'Errico before her; she was a huge star at the time he married her. He just really likes to see his face in the paper. He likes the press buzz. He likes being that guy from the band with famous girlfriends."

Sixx, 53, has been married twice, to Playboy Playmate Brandi Brandt and actress Donna D'Errico, and has five children.