"Yes I am his #1 girl again," she tweeted on Friday. "Yes we are happy. Hope that clears up any confusion!"
Harris, 26, and Hefner, 86, became engaged in December 2010 after two years together and were to set to tie the knot in front of 300 guests last June. However, days before the nuptials, Harris called off the wedding. She later said on Howard Stern's Sirius XM Radio show that sex with the Playboy mogul lasted "like two seconds."
"Then I was just over it," she said at the time. "I was like, 'Ahhh.' I was over it. I just like, walked away. I'm not turned on by Hef, sorry."
Hefner also expressed relief that he and Harris didn't exchange "I do's" in a separate interview. "Holly [Madison] suggested that I missed a bullet, and I think it's probably true," he told Enterainment Tonight. "Quite frankly, I don't know what I was thinking about. I think my natural state is single. I've tried marriage twice, not successfully. These were not the happiest times of my life."