The New York Post said Tuesday the mustachioed broadcaster was seen at the upscale Hotel Bel Air in Los Angeles Sunday night and is scheduled to appear on an upcoming edition of TV's "Dr. Phil."
Sources also told the newspaper O'Brien could be back on the set of Paramount's nightly entertainment-news show by next week.
O'Brien checked himself into rehab last month the day before three sexually explicit voice-mail messages that sound very much like him were posted on the Internet. In the messages, the caller was trying to coax a woman into a sexual threesome.
2014: The Year in Music [PHOTOS]