Singer Miley Cyrus remembered Ali with a photo on Sunday that showed her with the boxer and Liam Hemsworth. Captioned, "RIPCHAMP," the photo is from when the three met at the 2012 Celebrity Fight Night XVIII in Phoenix, Arizona.
Hemsworth posted the same photo, writing, "I'll never forget the day we met the toughest man on the planet. RIP Champ."
Ali died at 74 after a long battle with Parkinson's disease. A funeral is planned for the boxer in Louisville, Kentucky, where he was born.
In addition to Cyrus, Chris Rock, Madonna, Oprah and countless others have paid tribute to Ali on social media.