Hugh Grant knows a diva when he sees one, even it's himself. He issued an apology via Twitter yesterday after Jon Stewart called him out for being a jerk during an appearance a few years ago, reports the Daily News. "Turns out my inner crab got the better of me with TV producer in 09," he wrote. "Unforgivable. J Stewart correct to give me kicking." The "kicking" came when Stewart recalled Grant as one of his worst-behaving guests, complaining, for instance, about a certain clip being played. "And we've had dictators on the show."