American actress Dakota Johnson recently opened up about her "preconceived notions" regarding Justin Timberlake before they shared the screen in 'The Social Network'. The 34 year old actress, who is engaged to Coldplay frontman Chris Martin , reminisced about her role alongside the 43 year old pop icon in David Fincher's acclaimed 2010 film, where she played Amelia Ritter, a college student who has a fleeting encounter with Timberlake's character, Napster founder Sean Parker. Speaking to Vanity Fair, 50 Shades of Grey actress Dakota recalled being a 19 year old acting with Timberlake: "Are you kidding? I was just like 19 and straddling Justin Timberlake and like whipping him in the face with my hair.

100 per cent had preconceived notions, but he was lovely and kind and really welcoming for a person that was just a stranger." She reflected on the rigorous filming process under Fincher's direction: "I think that because this was 'The Social Network' and David Fincher, we did this so many times that I'm like, I'm in it. I know it, I know all the lines.

It's still there." Johnson also hinted at the intensity of the experience: "We did it so many times that I feel like I remember this and it's happening now. Maybe I was traumatised.

" Her interaction with Timberlake contrasted with the movie's lead, Jesse Eisenberg, who portrayed Facebook co-founder Mark Zuckerberg. In a past conversation with Andrew Garfield, also reported by Vanity Fair, Dakota shared insights into her time on se.