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

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

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

Philadelphia Phillies star Bryce Harper was out and enjoying his last weeks before spring training on Monday night, taking in the College Football Playoff champ

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

Los Angeles Lakers superstar LeBron James and Philadelphia Phillies slugger Bryce Harper were in attendance for Monday night's College Football

Ohio State defeated Notre Dame 34-23 to claim the national college football title at Mercedes-Benz Stadium. Led by Quinshon Judkins and Will Howard, the Buckeyes secured their ninth championship, with LeBron James and other sports legends cheering from the stands.

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.

LeBron James was in attendance at Mercedes-Benz Stadium to watch his beloved Ohio State Buckeyes play Notre Dame for the College Football Playoff championship.

The stars are out at Mercedes-Benz Stadium for the College Football Playoff championship game, including one of baseball's premier players. Phillies ... Ohio State, but he's a long-time Buckeyes ...

but the Phillies' biggest star wasn't' wearing a Philadelphia uniform Monday night. If you happened to tune into the College Football Playoff championship game between Ohio State and Notre Dame ...

According to FanDuel, the Chiefs are favorites to win the game, which will take place at the Caesars Superdome in New Orleans on Sunday, Feb. 9.