Forget Matthew Stafford and Cooper Kupp autographs ... here's one of the coolest pieces of Super Bowl LVI memorabilia you can own -- a ball signed by the Big Game's halftime show performers!!!
TMZ Sports has learned ... a pigskin that Eminem, Dr. Dre, Mary J. Blige, Kendrick Lamar and Anderson .Paak all signed following their epic show at the event in L.A. has just hit the block at Heritage Auctions.