The 25-year-old insisted that she felt uncomfortable when she had to "dry-hump" co-star Paul Ben Victor in the film.
She wrote in her Closer column: "I've just finished the first week of shooting on my new film Should've Been Romeo. My character Nicole is very different to me - she's a bit of a crazy groupie! I just had to dry-hump my co-star Paul Ben Victor for one of the scenes - and I was s**tting myself because it was so sexual and not me.
"It's been one of the most amazing experiences of my life - I want to do a gritty drama next."
