LA Ink Season 4 Episode 12 (LA Ink s04e12) with title “Kat Minus Sixx” aired on Wednesday, October 27th 2010 at 10:00 pm via TLC Network.
Here is summary for LA Ink Season 4 Episode 12 :

Nikki wants Kat to come on tour with Mötley Crüe, but she’s not sure it’s a good idea and starts to question the future of their relationship. Meanwhile, the tension between Amy and Ruthless reaches a boiling point.