Hugh Hefner has reportedly reconciled with his ex-fiancee Crystal Harris.

The aspiring singer left the Playboy mogul shocked when she called off their wedding just days before they were due to marry in June 2011 but after Crystal, 26, begged Hugh, 86, to reconcile he forgave her and allowed her to move back into the sprawling Playboy mansion.

"Crystal begged Hef to let her come back. He surprisingly doesn't have any hard feelings against her, so he let her move back into the mansion. Hef and Crystal are really happy back together," a source said.

Hugh's main girlfriend Shera Berchard - who has been dating the octogenarian since last June - has now reportedly moved out to make way for Crystal. "Shera Berchard, Hef's number one girlfriend, moved out as soon as Crystal moved back in," the source added.

It is unclear if the wedding will be rescheduled but insiders say not to rule it out.

"Never say never where Hugh Hefner is concerned," the source added.

Speaking after she backed out of the wedding last year, Crystal explained she knew it wasn't the right step for her: "I got cold feet. Over time I just realized it wasn't for me, it was all happening so fast. I actually spoke to Hef about it before I left and we both came to the decision that getting married wasn't the best for either of us."

Crystal also admitted they didn't have sex very often: "There was couch cuddling, movie nights. Hef's like a big kid." Asked if the relationship was physical, she added, "In the beginning, but after a while it just wasn't the most important thing to him."