The blonde beauty called off her engagement to Hefner last week (14Jun11) and packed up her pooch and moved out of the Playboy Mansion in Los Angeles, where she was set to become the publisher's wife on Saturday (18Jun11).
But Harris has since paid a visit to her ex and brought along her Cavalier King Charles, Charlie, who called the Mansion home.
As a kind gesture, Harris handed over her beloved pup to Hefner, who had become close to the pet.
Hef took to his Twitter.com account with the happy news and wrote, "Crystal brought Charlie back because she thinks he's happier here. I appreciate it, because I really missed him."
Harris has kept the engagement ring Hefner gave her when he proposed on Christmas Day (25Dec10), although she recently told one U.S. news show she'd hand the sparkler back if her ex asked for her to return it.