Rosario Dawson found it difficult walking around completely naked for her new movie.The 33-year-old 'Trance' star - who recently split from the movie's director Danny Boyle - has admitted she felt "insecure" walking around with nothing on and her co-stars including James McAvoy made the experience "more awkward" by refusing to look at her.Speaking at the world premiere of the movie at the Odeon West End in London's Leicester Square on Tuesday night (19.03.13), she exclusively told BANG Showbiz: "The hardest and scariest part about it was walking. I was trying to figure out, like, how do you walk in front of everyone when you're naked? I don't think you really plan to do that really well."It's actually interesting because everyone's trying to be really respectful and polite and not look at you, but that almost makes it a little bit more awkward because you know you're performing to a certain extent. Like, I'm standing there and I'm walking across the room and I'm like, 'Am I walking too slow? Should I move my hip a little bit more?' You really get self conscious about the stupidest things."It was really funny because I'm looking over at James and James is not looking at me at all. He's looking at my shoulder; he's looking at some spot on the wall. It's sort of just like, OK, just be in the moment, be in the character."Rosario said she prepared for the nudity as best as she could before even auditioning for the role.She said: "I was long since prepared to do it because, even when I read the script, I knew, 'Don't even bother auditioning if you aren't willing to do this.' That wasn't the part that was weird. It was just more my walk. It was just really strange suddenly realising on the day, like, that's a really weird thing to be insecure about all of a sudden!"Danny Boyle and Rosario Dawson were "very cosy" at the world premiere of 'Trance'.The director and actress - who were rumoured to have ended their romance earlier this month and reportedly avoided each other while promoting the upcoming heist thriller in Los Angeles over the weekend - appeared to be on good terms at the film's premiere in London's Leicester Square on Tuesday (19.03.13), laughing and joking with each other on the red carpet.An onlooker told BANG Showbiz: "Danny and Rosario didn't look awkward around each other, nor did they avoid each other on the red carpet. In fact, they looked very cosy at the premiere."They did a group photo with James [McAvoy] and Vincent [Cassel], and Danny had his arm around Rosario's back and they appeared to be sharing a chat, whispering in each other's ears and laughing in between photos. They seemed friendly with each other."It had previously been reported that the 33-year-old actress and Danny, 56, went out of their way to avoid each other at the film's LA junket last week.A source said: "Rosario and Danny didn't interact during interviews. It was pretty obvious they're no longer a couple. He was talking to a group of people when she arrived and it was awkward - like a cold greeting, no hug, and they got through it as quickly as possible."