Tim Cook slated to guest on The Late Show on Sept. 15

Colbert made the announcement via Twitter on Friday, saying, "Siri, put Apple CEO Tim Cook on my calendar for Tuesday, Sept. 15. Oh, and come up with some questions to ask him." Embedded in the tweet is a picture of Colbert talking to Siri on his Apple Watch. It is not yet known if Cook will be the show's first guest, or will be squeezed in before the compulsory musical act.

CBS's "The Late Show" began airing this week after taking a brief hiatus as Colbert moved in to take over for longtime host David Letterman. The show opened to good reviews, but viewership dipped after its premiere on Tuesday. So far, guest highlights include George Clooney, presidential nominee Jeb Bush and Vice President Joe Biden, as well as technology industry heavyweights Elon Musk and Uber CEO Travis Kalanick.

For Cook, the upcoming public appearance will be the first of two for September, as he is scheduled to attend Box's annual Boxworks cloud storage conference on Sept. 28. Aside from Wednesday's "Hey Siri" event, the Apple chief just recently appeared on "Good Morning America" to discuss his company's role in the ConnectED education program and a week later popped in at Cisco's annual sales conference. Cook is also slated to talk at The Wall Street Journal's WSJ.D Live conference in October.

Cook's episode of "The Late Show with Stephen Colbert" airs next Tuesday, Sept. 15. Showtimes vary depending on local affiliate scheduling.