Gwyneth Paltrow Jokes She's the MCU 'Grandparent' at 'Avengers: Endgame' Premiere (Exclusive)

The actress has played Pepper Potts since the very first 'Iron Man' film back in 2008.

Avengers: Endgame is the 20th film in the Marvel Cinematic Universe, and Gwyneth Paltrow has been there from the very beginning.

The actress, who has played Pepper Potts since the first Iron Man movie back in 2008, stopped to chat with ET's Kevin Frazier at the Los Angeles premiere for the massively anticipated film on Monday, and joked about how the hubbub surrounding the release of a new Marvel movie is almost old hat for her at this point.

"It's pretty cool, you know?" she noted. "I think when we did [the first] Iron Man, Marvel had no idea what it would be, and this level of success it would have, and all the other movies that would come out of it, so it's pretty cool. I mean yeah, we kind of feel like the parents or grandparents at this point, but it's pretty awesome."

The mother of two certainly didn't look like anyone's grandma at the premiere, showing off her toned legs in a black blazer ensemble with short shorts and skinny-strapped high heels.

Alberto E. Rodriguez/Getty Images for Disney)

Endgame is poised to be the ultimate battle for the OG Avengers, and nearly every character -- including Pepper -- has their fate hanging in the balance. But the cast and creative team have done a great job keeping secrets, to the point where Paltrow was hesitant to answer whether or not she'd be willing to reprise the character in a future film. "I thought we were done?" she asked with a laugh.

"Look I would always [come back] if they needed me, but I think, you know, the movie is called Endgame. I feel like maybe we're off to other Marvel pastures," she added, before admitting, "I don't really know, they don't tell me anything. And all the scripts are redacted and everything, so it's a very secret process."

In fact, when shooting Endgame, some notoriously loose-lipped Avengers got fake scripts to throw them off the spoiler scent!

"I got a script, but it was a dummy," Mark Ruffalo revealed to ET at the Monday premiere. "There were scenes in there that I thought we were shooting that nobody ever shot."

See more in the video below. Avengers: Endgame hits theaters on Friday.