Kat Von D is back on the market again. The popular tattoo artist, 31, has called it quits with Joel Zimmerman, known professionally as DeadMau5. According to her twitter, the LA INK star cited infidelity as the reason for the end of their engagement. "Cheating on your loved one is the most hurtful thing one could do. I hate to have to admit, that this relationship is indeed over," Kat twittered on June 26. However, Deadmau5 released a statement on Facebook agreeing the couple had indeed split up but that he never cheated on her while they were together. One thing is certain, this relationship is over.