Forget Von Miller and Case Keenum ... the hottest autographed Denver Broncos jersey is TAYLOR SWIFT!
The singer signed a #13 jersey for the NFL team's big Kickoff Luncheon charity auction -- and it's already getting more heat than some of the biggest players on the team.
At time of post, bidding is already at $450 -- more than twice the price for an autographed helmet from Terrell Davis ... who's a HALL OF FAMER!!!
Some of the other items up for auction -- a Peyton Manning signed football (less than Swift), Tiger Woods signed hat (way less than Swift) and a Ryan Tannehill signed helmet (not even close).