The Kat Von D having a meltdown in Hollyweird and blasts L.A. Ink producers over Nikki Sixx

Kat Von D just went nuclear on the producers of her reality show "L.A. Ink" -- threatening a legal war over several scenes that feature Kat trash-talking her on-again boyfriend Nikki Sixx.

Sources close to the production tell us ... Kat went ballistic on producers earlier this week when she viewed screeners for upcoming episodes of "Ink" which air on TLC starting Wednesday night ... which contained several scenes featuring Kat going off about her then ex-boyfriend Nikki Sixx.

Here's the problem -- the footage was shot a while ago, while Kat was dating Jesse James ... and back then, she still harbored some ill-feelings toward Nikki. READ THE REST HERE ON TMZ

Kat Von D's latest look...

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Tom Green tattoos Kat Von D

Hollywoods new power couple? Kat Von D and Jesse James

New couple Jesse James and Kat Von D packed in some serious PDA during a romantic weekend in Texas -- taking walks, holding hands, kissing ... and riding on motorcycles without helmets.

Check out the rest on tmz.com

Kat Von D and Jesse James?

Jesse James & Kat Von D -- It's On!

What happened to Nikki Sixx? Read more TMZ

More Dan Smith tattoos from High Voltage Tattoo in Hollywood

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Tattoos by Nate Fierro at High Voltage Tattoo aka "LA Ink"

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Kat Von D looking great as usual

See more at www.katvond.net

Video of Kat Von D and Dan Smith discussing music and tattoos on Last Call with Carson Daly

See Carson interview Kat and Dan discussing his band Dear & Departed, tattoos and Kat's possible new venture into music...

Tattoos by Kat Von D of LA ink at High Voltage tattoo

This one was so much fun! (on pro-skater, Jamie Thomas)

neck tattoos are hot.

Dont you wish you thought of this one first?

birdcages.... Photo by: Ville Akseli Juurikkala

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Kat Von D and some of her photography

Bam Margera photo by Kat Von D

photo by Kat Von D

photo by Kat Von D

photo by Kat Von D, See more HERE

Kat Von D at work!

Courtesy of Kat's twitpic

Kat Von D is now a redhead

Norway

Hollywood see more of Kat HERE