Jessica Brown Findlay has confessed that "even the red carpet" leaves her starstruck at showbiz events.
The actress works alongside stars such as Dame Maggie Smith and has an audience of millions on Downton Abbey, but premieres and awards dos still give her the jitters.
The 22-year-old, who attended the Baftas last week, said: "It is completely nerve-wracking. To say it wasn't would be lying, massively, they are scary... Awards are kind of surreal and it's just amazing to be invited.
"Even the red carpet starts making me go, 'Wow!' Just as I was getting out of my car at the Baftas, George Clooney just got out of his car, which was wonderful, because it massively took the pressure off me, and I could just run up the carpet."
Jessica will be joined on the next series of Downton by US star Shirley MacLaine, who will play her character Lady Sybil's maternal grandmother.
"I haven't met her yet, I'm really excited to meet her, and probably a little bit nervous, I should be I suppose, I should be nervous about that," Jessica said.
"There'll be cat fights all over the place (between Shirley and Dame Maggie)," she teased. "No, I'm really excited, it's going to be wonderful to have those two hugely established actors together."
Jessica remained tight-lipped about what lies in store for Lady Sybil and her new husband Branson.
"They're just a really beautiful couple and I'm so glad it worked out for them. I'm really excited to go through all the scripts and see what will happen to them," she added.