Harris ran off from the Playboy Mansion in June 2011 ... just five days before their big day, she then tried to pawn her engagement ring and fight the octogenarian for custody of their dog.
But there's no fool like an old fool, some might say, and according to TMZ, it's all on for keeps this time with a New Year's Eve wedding scheduled.
They report: 'Harris and Hef are better than ever these days, since Harris moved back into the Playboy Mansion earlier this year.
'We're told the couple have worked out all their previous problems and decided recently they want to try and get married again.'
According to their sources: 'Harris feels the time she spent apart from Hefner really taught her how to be independent and stand on her own two feet, something she felt she needed.'
And she's not going to go shopping for a new wedding dress this time - as she's reportedly planning to wear the gown she had bought for the original intended date.
RadarOnlinereports that Crystal will walk down the aisle wearing the frock she had intended to wear during the June wedding.
But that's not all she'll be sticking to - the blonde also still has all the favours to give out to the guests at the ceremony, albeit fewer this time around.
Traditional etiquette says that if the bride-to-be ditches the groom before they walk down the aisle she should give back the engagement ring.
But Harris not only kept the three carat diamond ring worth an estimated $90,000, but a Bentley too after leaving her former fiance Hugh Hefner at the alter.
To add insult to injury, the runaway bride wanted custody of their dog Charlie as well.
Shortly after Hefner and Harris ended their engagement in June 2011, the Playboy mogul said Harris let him keep Charlie, their shared Cavalier King Charles spaniel.
'We both love the puppy,' Hefner told People magazine. 'I told her if she wants to keep the ring and the Bentley, then maybe I can keep the puppy. I hope we will work it out.'
Hefner, who still insists he 'missed a bullet' by not tying the knot with Harris also added: 'The puppy's valuable, but not $100,000 worth.'
Harris called off the nuptials at the 11th hour announcing her decision on her website.
'I have decided to end my engagement with Hef,' she wrote. 'I have the utmost respect for Hef and wish him the best going forward. I hope the media will give each of us the privacy we deserve during this time.'
She then went on to party in Vegas on the planned day of the wedding and gave a radio interview in which she said: 'I’m not turned on by Hef. He doesn’t really take off his clothes. I’ve never seen Hef naked.'
But Hefner refused to hit back, simply saying: 'The breakup is a heartbreaker, but better now than after the marriage.'
'After all is said and done, staying single is probably the best,' he posted on his Twitter account.
And he insisted they remained good friends.
The aging lothario originally took to Twitter the day after the couple broke up expressing his sadness about missing the dog.
'Crystal took Charlie with her when she left,' he wrote.
But he was thrilled to be reunited with the pooch soon afterwards.
'Crystal brought Charlie back because she thinks he's happier here & I appreciate it, because I really missed him,' Hefner posted.
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