Kat Von D and Nikki Sixx are no more… Von D has moved on and is now dating Jesse James, as we briefly saw in a tweet that said, “Yes, Jesse and I are dating” (soon after, she deleted the tweet!).

So, what happened with Kat Von D and Nikki Sixx? When did Kat and Nikki break up?

Kat Von D and Nikki Six first broke up in January, after reportedly dating for two years.

In January, Nikki Sixx confirmed that he and Kat Von D had split, writing on his MySpace page: “I want to wish Katherine nothing but the best in her life. She has loved and inspired the hell outta me and I know I have done the same for her in these almost two years we ruled the earth together.

We are taking a break from our relationship for reasons that we will choose to keep personal. You won’t find me saying a bad word about her and I don’t believe vice versa… We have too much wonderful history together to ever deface that.”

Kat Von D and Nikki Sixx were apparently back together a couple of months later, with Kat tweeting: “So annoyed! Contrary to silly rumors, Bam Margera and I are NOT dating. I’m currently in a relationship with Nikki. Hope that clears things up.”

Nikki Sixx appeared on the season premiere of Kat Von D’s “LA Ink,” where he interviewed then girlfriend Von D for his radio show Sixx Sense. (Check out the video clip.)

No word on when exactly Kat Von D and Nikki Sixx broke up again – they were spotted together in Sweden earlier this month.

As for Kat Von D and Jesse James dating, she was seen in Las Vegas over the weekend holding hands and having dinner with James.

We’ll see where this relationship goes…