Celebrity Makes Surprise Appearance At Caitlin Clark's Jersey Retirement

Letterman's appearance was definitely a surprise to viewers but they seemed to be loving it online.

"Oh just David Letterman hanging out with Lisa Bluder for the Iowa game," a user said.

"If David Letterman doesn't give us a Caitlin Clark-related Top Ten List as part of the ceremonies I am going to be very upset," another replied.

"When did CC and Bluder become bffs with David Letterman?" a fan smiled.

"Iowa State has a guy that looks like Jim Carry go to their games. Iowa has David Letterman at theirs," another user joked.

"Ah yes renowned Iowa hoops fan David Letterman," another person posted.

"Things I never thought I would type, David Letterman is at Carver Hawkeye Arena."

"David Letterman and Lisa Bluder palling around in Iowa City only adds to my gnawing feeling that I'm being tested by a more-advanced civilization on how much I'll believe," another fan joked.

Letterman has recently been spotted palling around with ex-Iowa coach Lisa Bluder and her husband.

And now the two are taking in the action together as Iowa looks to upset JuJu Watkins and the No. 4 USC Trojans with tournament time right around the corner.