Who has been your favourite celebrity guest star?
"It's so hard to say. Matt Damon was a lot of fun this year, I have to say."
He's popping up in the season six finale. What was it like working with him?
"He's a really great guy. I'm very happy to meet him. He's really genuine and down-to-Earth and respectful."
What can we expect to see him getting up to?
"He plays a passionate activist actor and he's rolling with some pretty heavy hitters."
Daniel Dae Kim (ABC's "Lost") and John Slattery (AMC's "Mad Men") will join Matt Damon in "The Adjustment Bureau," a sci-fi romance based on a Philip K. Dick short story.
Michael Kelly ("Law Abiding Citizen") has also joined the cast, as Damon's best friend and campaign manager.
"It's like a modern love story, but it's got an ominous sci-fi backdrop to it," Blunt told MTV News during a break in shooting on location in New York City. "It's going to be exciting and disconcerting and strange, which is what I like about [Dick's] work. It's very cool and clever. It's got a really tight script."
Yet for all its admirable plot geekery, "Adjustment Bureau" is a character-driven story that keeps its focus on Damon and Blunt's stumbling, can-they-make-it-work-when-the-universe-i
"The term soulmates is used so casually, but in this case, in this film, it is true," Blunt explained. "They are sort of destined to be together and they fight fate to be together."
Though the film is written and directed by "Bourne Ultimatum" scribe George Nolfi, expect Damon to be less super-skilled action star and more scrambling everyman. The bulk of the training fell to Blunt.
"Matt's thrilled because this time it's me who's been thrust into the month of training, because I play a dancer in it, which is kind of arduous training seeing as I've never bloody danced before. And Matt is actually thrilled that for the first time it's me who has to do that kind of thing and he's got off scot free."
A Star reader was staying at the Four Seasons in Toronto when, she says, "I saw this couple kissing passionately on the couch" and realized it was Matt Damon and wife Luciana. Why the PDA? "When Matt gained weight for ‘The Informant!', he felt gross," says a different source. "Now he's working hard on his body and bringing back the romance in his marriage." You could say he's Bourne again.