The 2026 Oscars was full of stars, but some celebrities missed out on the action. Conan O'Brien hosted the 98th Academy Awards at Hollywood's Dolby Theatre on Sunday, March 15, and a lot went down during the lengthy ceremony. Between a surprising tie, a shocking upset leading to Michael B. Jordan's win and a golden performance, the awards show was a must-watch - but not for some people. Now a three-time Oscar winner, One Battle After Another star Sean Penn was noticeably absent from Sunday's ceremony.