Segel coyly told Yo, "I think we would just very much like to be happy. That's all I'm going to say about it."
Blunt chirped, "He's a man-boy! He used to be a boy-boy and now he's a man-boy." Jason added, "I think I might even be becoming a man-man... potentially!"
In "The Five-Year Engagement," the two friends play a couple that hits a number of snags on their way to the altar. Segel co-wrote the film with Blunt in mind.
He explained, "You want it to feel organic and you want it to feel like you're actually friends on screen. Emily was my friend and she's like the best actress in the world."
Yo pointed out that Segel says the same of all his co-stars, including his last one in "The Muppets." Jason defended himself. "Miss Piggy? I meant it." Emily jumped in, "He has to say that about her because she's a diva."
"The Five-Year Engagement" heads down the aisle April 27.