However, the focus stayed firmly on Ozzfest, rather than the Osbournes' personal life.
"I want to say a huge, huge thank you to all of you for joining us today and for always supporting us," she told the cheering crowd. "We all know without you guys, we're nothing."
ABC News asked the Black Sabbath frontman if he was surprised that Sharon was there to support him, but the musician's publicist ended the interview before he could respond.
Earlier this week, Sharon spoke out about reports that her marriage of nearly 34 years was ending.
"I'm not with him," she said on "The Talk." "I just need time to really think about myself ... what do I really want for the rest of my life."
The talk-show host, 63, added that she and her rockstar husband, 67, are no longer living together, though they are on speaking terms. She also admitted she wasn't sure a reconciliation would be possible.
"I love Ozzy dearly," Sharon said. "[But] at this point I can't answer that because I don't know what I want."
The Osbournes married in 1982 and have three children together: Aimee, 32, Kelly, 31, and Jack, 30.