The actress made light of the pair's relationship during the 2013 Daytime Emmy Awards in Los Angeles on Sunday (16Jun13), when she served as an award presenter, after spotting the Black Sabbath frontman in the audience with his talk show host wife, Sharon.
She quipped, "Ozzy, I haven't seen you since rehab..." before going on to introduce the category for Outstanding Special Class Animation Program.
The then added, "Our nominees, they take us into worlds we've never seen before, unlike, like Ozzy and myself, you've taken acid, in which case... yeah. Same dealer."
Fisher's comments raised a few laughs at the Beverly Hilton hotel, and, returning to U.S. talk show The Talk on Monday (17Jun13), Sharon Osbourne revealed the recovering addicts had actually been in rehab together many years ago.
She explained, "Everybody (at the Emmys) thought that that was a joke, but it's serious, they were in rehab together... After they came out of rehab they would go to meetings together and she would call the house... and say, 'It's Princess Leia (Fisher's character in the Star Wars franchise),' and (my son) Jack would go, 'Mummy, Princess Leia's on the phone!'"
Ozzy Osbourne recently confessed to suffering a drink and drugs relapse but is now celebrating over 100 days sober.