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Katy Perry was a huge Ole Miss fan this weekend. She appeared on ESPN's College GameDay where she enjoyed the game and even colored her hair buns Rebel red ...

... and even correctly predicted their victory!

She also was an honorary cheerleader:



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She became president of the Trevor Knight Fan Club (Oklahoma's quarterback), and threw some corn dogs around while talking about LSU.

While Trevor's not available ... his brother is...

So how did Katy celebrate the Ole Miss victory??? By partying at a local bar. An amazing Vine shows Katy chugging a beer on top of a bar and then stage-diving into the crowd!

Photo: Getty Images