Picture - Sacha Baron Cohen and Empire Leicester Square

"He came over to me at the premiere... and he was so nice, and he, like, reached to shake my hand and started saying words - I don't remember what they were - I went sort of blank and I remember saying, 'I know you...' What I was trying to say is, 'I know you had such a great involvement...' all these articulate things in my head and I went, 'I know you...' (and started giggling nervously)." Actress Carey Mulligan lost her cool when meeting her hero Jay Z on the red carpet at The Great Gatsby premiere in New York on Wednesday (01May13).