Shia LaBeouf on Rihanna romance rumors: "I really don't know her like that"

Shia LaBeouf has revealed that when rumors surfaced that he was dating Rihanna last year, he had to endure weeks of listening to his friends humming the singer's biggest hit: Umbrella.

"My friends were like, 'Are you serious, bro? Why didn't you tell me about that?' I was like, 'I really don't know her like that.'

"For weeks they were singing that "Umbrella" song everywhere I walked. And those are my people!" he tells GQ magazine.

LaBeouf, 21, also said that when it came to preparing for his new movie Indiana Jones and the Kingdom of the Crystal Skull -- in which the actor stars as Mutt Williams alongside Harrison Ford -- he "never worked so hard for anything in my life. I did four months of sword fighting and bike training. And I spent insane amounts of time on the switchblade."