Warren Buffett -- Bullish on Creighton University

Billionaire Warren Buffett didn't just go to see the Creighton Bluejays play the Villanova Wildcats yesterday ... he looked liked the biggest diehard fan in the building.

Buffett -- known as the "Oracle of Omaha," which is where Creighton is located -- was on hand as a guest of Creighton President Timothy Lannon.

Buffett even posed for pics before the game with the school's best player, Doug McDermott.

Just Warren Buffett and Doug McDermott. pic.twitter.com/pCjooySzqI