Speaking to E! Online, the star - who dates fellow American Horror Story star Evan Peters - spoke about her bedroom scene with the hunky actor at the Hollywood premiere.
She recalled: "It wasn't (awkward), because James is so lovely and he didn't make it weird. It wasn't weird, but there was definitely a point where you're like, ‘How much longer until you say cut?'"
"What people don't realise is people are always like, 'Oh, you got to make out with James Franco!' I'm like, 'Yeah, and 30 people stood there and watched!' It's so not romantic at all."
She went on to admit that all her family and friends were jealous of her locking lips with James, joking: "Guys, girls, everybody. My mom was asking about it. I've never had so many people ask me about a kiss that wasn't even real in my whole life ever."
Aside for smooching, Roberts went on to admit that she's always wanted a role in the movie since reading Franco's Palo Alto short stories years ago.
The 23-year old explained: "I read James Franco's book literally the day it came out.
"I got it at Book Soup in L.A. when they were putting it on the table. I read it in three days and I remember calling my manager and being like, ‘If this gets made into a movie I have to be in it.'"