The 85-year-old Playboy boss was set to make the 25 year old his third wife on Saturday (18Jun11) but she cancelled the nuptials on Tuesday (14Jun11).
Harris, who is said to have moved out of the Playboy Mansion in Hollywood, has now spoken out about the split, telling fans she still cares for the publishing mogul.
In a statement, she writes, "After much deep reflection and thought I have decided to end my engagement with Hef. 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."
Hefner confirmed the split reports on Tuesday (14Jun11) with the simple tweet: "The wedding is off. Crystal has had a change of heart."
The couple was planning a garden party wedding at the Playboy Mansion and had invited 300 guests.