Who Was that Hooded Man?

Last week, I saw what looked like an uncredited cameo by Viggo Mortensen as Aragorn on The Colbert Report. The video of the scene should be here. I'd like someone to confirm whether Viggo was indeed under the Strider costume. Although his voice didn't sound quite right--I'm so used to the soft-voiced Viggo rather than the troups rousing Viggo--he was wearing the beard I've seen him in promoting his new movie and it sure looked like him in the close-in shots. That final line about going after some orcs made it seem pretty likely it was Viggo--just in case the audience had doubts.