The couple were previously engaged, but split up just days before their wedding.
However, the pair announced recently that they have reconciled and have now celebrated Independence Day together.
© Twitter / @CrystalHarris
Both Harris and Hefner posted photographs of themselves on their Twitter pages, with Harris saying: "Hef & I... 4th of July!"
Meanwhile, Hefner captioned his picture: "My honey @CrystalHarris and I #Happy4th"
The images are the first pictures of Hefner and Harris together since their reconciliation.
© Twitter / @hughhefner
Harris also DJed at the party, with Hefner posting a photograph of her with fellow performer DJ Dwrek.
Other guests at the event included Hefner's son Cooper and actor Corey Feldman, while Hefner played backgammon with attendees and set up a "slip n slide" race.









