'How I Met Your Mother' 100th Episode Cast Interviews - VIDEO

Congratulations, 'How I Met Your Mother'!

The Emmy-nominated show is hitting a huge milestone -- their 100th episode -- and they're celebrating rather appropriately with a big song-and-dance number and plenty of guest stars (Mon., Jan. 11, 8PM ET on CBS). AOL TV visited the set while they were shooting the big show to get the scoop on what to expect straight from the stars and creators. What we ended up getting was so much better ...

The highlights? Neil Patrick Harris dishes about Barney's big musical performance; Alyson Hannigan reveals she's "kind of obsessed" with one of the big-name guest stars; Cobie Smulders talks about the Barney-Robin relationship aftermath; Josh Radnor teases how close we'll get to meeting Ted's future wife, the show's long-awaited 'Mother,' in this episode; and Jason Segel admits that just reading the episode's script made him emotional: "I almost started crying!" Awww.

Creators Carter Bays and Craig Thomas were not as forthcoming, though. "We might as well spoil it," Bays says with a grin. "As of right now, Ted dies." OK, that's so obviously not the case, but maybe Marshall and Lily will be making a big life change soon ... or, if you listen to Jason Segel, maybe not. "Marshall would be a fantastic father, he'd love the kid. It's literally the logistics of Jason Segel, holding a baby, that they're afraid of."

Yep, they're all just as funny in real life. There's a reason the show has lasted this long ... watch our set visit video to see it all.Congratulations, 'How I Met Your Mother'!

The Emmy-nominated show is hitting a huge milestone -- their 100th episode -- and they're celebrating rather appropriately with a big song-and-dance number and plenty of guest stars (Mon., Jan. 11, 8PM ET on CBS). AOL TV visited the set while they were shooting the big show to get the scoop on what to expect straight from the stars and creators. What we ended up getting was so much better ...

The highlights? Neil Patrick Harris dishes about Barney's big musical performance; Alyson Hannigan reveals she's "kind of obsessed" with one of the big-name guest stars; Cobie Smulders talks about the Barney-Robin relationship aftermath; Josh Radnor teases how close we'll get to meeting Ted's future wife, the show's long-awaited 'Mother,' in this episode; and Jason Segel admits that just reading the episode's script made him emotional: "I almost started crying!" Awww.

Creators Carter Bays and Craig Thomas were not as forthcoming, though. "We might as well spoil it," Bays says with a grin. "As of right now, Ted dies." OK, that's so obviously not the case, but maybe Marshall and Lily will be making a big life change soon ... or, if you listen to Jason Segel, maybe not. "Marshall would be a fantastic father, he'd love the kid. It's literally the logistics of Jason Segel, holding a baby, that they're afraid of."

Yep, they're all just as funny in real life. There's a reason the show has lasted this long ... watch our set visit video to see it all.