Reeg will kick off "Guest Host Week" on "Piers Morgan Tonight" on Tuesday
"Piers" executive producer Jonathan Wald tweeted the news of Philbin's first "Piers Morgan Tonight" guest-hosting gig.
Philbin, who left his co-hosting spot on ABC with Kelly Ripa last November, has yet to make a regular return to TV, though he has guest-hosted "The View" and made guest appearances on "Late Night with Jimmy Fallon," "Celebrity Apprentice," "The Talk," "Today" and, of course, "The Late Show with David Letterman."
Letterman was a guest during Philbin's last week of "Live With Regis and Kelly" last year, when he congratulated the 80-year-old with a kiss on the lips.
Photo from CNN