Getty / TikTok @collegegameday Composite

Selena Gomez and Benny Blanco might have a few haters on their big day, including one big-time celebrity ... the feisty Oregon Duck!

Here's the deal ... the University of Oregon is facing off against Penn State University Saturday afternoon in Happy Valley, PA with kickoff set to take place at 4:30 PM PT.

However, attendees got an early start on the festivities because the popular college football pregame show "College Gameday" set up on PSU's campus to preview the exciting matchup ... and The Oregon Duck whipped out a sign while in the crowd.

OU's faithful mascot's sign reads, "Imagine being at a wedding right now" in all caps ... and, while it doesn't get more specific than that, tons of people online are sure he's referring to Gomez and

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