Rock said he had met the president on Sunday at the Kennedy Center Honors gala and the two joked about being on opposing sides during the campaign.
The rock musician, though, said it was difficult to watch Romney lose the race, but said he was proud of speaking up during the campaign.
“It's tough to stand up for something you believe in. Believe me, especially in my business. I alienated a lot of fans and people,” Rock said.
He added that he was also ready to “move forward.” “You respect the office of the president of the United States, and the great thing is in four years, we get to choose again,” he said.
Rock appeared at a Romney rally during the campaign, introducing GOP running mate Rep. Paul Ryan (R-Wis.) at a Rochester, Mich., event in October.
At the event, Rock said he was “sorry” Obama had not done a “better job” as president.
His hit song, “Born Free,” has became a staple at Romney rallies, and he played a private concert for GOP supporters during the party’s convention week in Tampa, Fla.