The conclusion of LA Ink was far from Kat's last time in the spotlight. After wrapping the show, she released her first book, High Voltage Tattoo, which reached number six on the New York Times bestseller list. Her second book, The Tattoo Chronicles, smashed that record and reached the third position on The New York Times Hardcover Advice & Misc. bestseller list. Aside from writing, her 2008 makeup collaboration with Sephora was a huge success and spurred years of collections to follow.
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When she wasn't opening art galleries or launching clothing lines, Kat worked on a variety of music projects as well. She was featured on "X," the 2012 album by Finnish gothic rock band The 69 Eyes, the song "Black Leather" by duo Prayers in 2016, and helped narrate Chris Delforce's animal rights documentary Dominion in 2018.
On Jan. 16, 2020, Kat told fans that her makeup brand was sold to its parent company, Kendo Brands. The label was then renamed "KVD Beauty," with the "KVD" standing for "Kara", "Vertias", and "Decora," which translates to "Value", "Truth" and "Beauty," per Insider.
Kat shocked the world yet again back in October 2021 when she shared that she was going to close High Voltage on Dec. 1, 2021, and move with her family to Indiana. She plans to open a private tattoo studio in her new home, per WLWT.