But whenever we do a premiere, or he has to be in the fray in some work-related context, he's terrified." Downey told something similar to Jimmy Kimmel the night after the premiere: "Chris Evans is such a nervous Nellie," he said."We're supposed to drive in in the Audis, and he's like, ' Bro, I don't know – should you go first, or I should go first? '" (Later, to , he also says Evans had to excuse himself for a cigarette.) You'd think this stuff would be easy for Evans by now.He's one of the biggest names in the Marvel Cinematic Universe, the sprawling, $8 billion Disney-owned enterprise that includes his three franchises; and the all-star Avengers team-ups, two of the top-grossing movies of all time.

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and the product placement apparently extends to the premiere, where he and his co-star/antagonist in the film, Robert Downey Jr., have been asked to arrive in matching Audi R8s – red for Downey's Iron Man, blue for Evans' Cap.

Up until then, Evans was having a stress-free evening, pre-partying at his home in the Hollywood Hills with his mom and brother and some buddies from back home in Boston, getting loose before his big night.

But when he got to the theater and had to do the car thing – that's when the anxiety kicked in.

"It's a little nerve-racking," Evans says two days later.

"You're in the SUV with your family, your people.

And then you have to pull over in some weird parking lot and do the swap. All of a sudden you're out of your comfort zone. The little things that can tip you over." "It's funny," says Scarlett Johansson, a frequent co-star who's known Evans since she was 17.

"He's extremely easygoing, he loves to hang out, he loves to be around people.

While it is not known what exactly caused Evans's stomach to become upset, the presenter - who was drafted in to revamp the show's image - was in need of a break, as he shakily made his way off the track.

The figures are expected to grow when consolidated with the numbers of those watching online but still lag miles behind the numbers the programme's old guard - Jeremy Clarkson, James May and Richard Hammond - pulled in.