"Reggie worked hard for that Heisman and deserves it. He earned it!" Kardashian, 29, told People magazine.
The University of Southern California returned the Heisman Trophy Bush won in 2005 while playing for the Trojans and also removed his jerseys and other memorabilia from campus after an NCAA investigation found Bush violated rules when he accepted "lavish gifts" during his time at USC.
"I really don't think it's fair to give it back," Kardashian said. Bush has not been ordered to return his copy of the trophy, People said.