Nicki Minaj struggled to remember the name of her 'The Other Woman' co-star Leslie Mann.

Leslie said: "Nicki Minaj never remembered my name. She just referred to me as 'lady'.

"She would just say, 'Come, lady'. And I was like, 'OK!' "

However, Leslie's co-star Kate Upton thought the singer's behaviour was due to her being "overwhelmed and intimidated by the actress and fellow 'The Other Woman' star Cameron Diaz.

Speaking as part of a Twitter takeover for Yahoo! Celebrity, Kate told Leslie and Cameron: "You know why she probably didn't remember your name? It's because she was really overwhelmed.

"You remember I had that big mark on my back and you had both your heads in my dress. Because I hurt myself and you were checking me out and she was like, 'I have a feeling they're going to do that to me next!' "

In the movie, Nicki plays Lydia, the assistant to Cameron's character Carly, who is left stunned when she learns her boyfriend is married to Leslie's character Kate, and also cheating on her with a third woman, Amber, played by Kate.