WATCH: Fox & Friends Celebrates Fox News Channel's 20th Anniversary
Steve Doocy and Brian Kilmeade, who have also been here since Day 1, flashed back to a 1999 episode of Fox & Friends featuring Sean.
Later in the show, The Factor host called in. You may not know that Bill's show was originally called "The O'Reilly Report" and was on at 6pm before it was moved to 8pm, where it remains dominant to this day.
Doocy noted that many critics predicted Fox News Channel would fail, but instead it has risen to become the most-watched cable channel.
"It's the same as in sports. You put together a good team and the team performs. And the folks [notice] and obviously the folks have chosen to watch in great numbers," O'Reilly said.
At the end of the show, we saw a special highlight reel marking 20 years of America's most-watched cable news morning show.
From J-Lo to The Rock to Doris Roberts to Brian "kissing" Susan Lucci, it's been quite a ride!
Watch the awesome highlight reel below.