Philadelphia Phillies star Bryce Harper was spotted on the sidelines of Monday night's College Football Championship donning Ohio State gear. But why?

LeBron James, a passionate Ohio State Buckeyes fan and Akron native, showed his support during the College Football Playoff (CFP) championship game on Monday night. Held at Mercede

Lakers superstar LeBron James was seen rocking Buckeyes gear in a luxury box, while Phillies star Bryce Harper was also in attendance and on the field pregame. Buckeyes legend, and 1974 and 1975 Heisman Trophy winner, Archie Griffin was also on hand to cheer on his alma mater, while hip-hop star Travis Scott also attended.

LeBron James and Bryce Harper headline Ohio State fans at Monday's CFP championship game vs. No. 7 Notre Dame. Here's more:

Benz Stadium to watch his beloved Ohio State Buckeyes play Notre Dame for the College Football Playoff championship.

We've already seen the likes of Travis Scott and Joe Montana down on the sidelines during pre-game warmups, and cameras have also caught pro stars LeBron James and Bryce Harper in attendance as well. Harper was seen down on the field before the game, while James was up in a suite waiting for the game to start.

There were quite a few celebrities on hand to watch the Buckeyes face the Fighting Irish with a national title on the line.

Phillies star Bryce Harper is cheering on the Buckeyes at the national championship game, and he has a good reason.