It's Conan O'Brien's first night as host of NBC's "Tonight Show." The show starts at 11:35 p.m. Guests include Will Ferrell and Pearl Jam.
"The Tonight Show With Conan O'Brien" fills a late-night TV spot Jay Leno held for 17 years. The spot on NBC has also been occupied by Johnny Carson, Jack Paar and Steve Allen.
O'Brien appeared as Leno's last guest on his show last Friday.