Matthew Mcconaughey's wife didn't recognise him in 'The Dallas Buyers Club'.

The 43-year-old actor dramatically lost 50 pounds for his role as an AIDS victim in the new drama and his spouse Camila Alves admits she was shocked by his transformation.

Quizzed about her favourite movie starring Matthew, she said: ''I think 'Dallas Buyers Club' is my favourite movie right now. It's the one that I really did not see one cent of my husband in it.''

The 30-year-old beauty also admitted to seeing a change in mood in her husband while he filmed the movie.

Prompted by the actor on whether he was ''grumpy'' at home during the shoot, she said: ''You were not grumpy, but your sense of humour was definitely different.''

The couple - who have three children, Levi, five, daughter Vida, three, and 10-month-old Livingston - got married in 2012 after six years together and Matthew loved seeing his wife walk down the aisle.

He told Access Hollywood: ''For me [the best part] was when your dad walked you out and walked you down the aisle. For me personally it was.''

Matthew's co-star in 'Dallas Buyers Club', Jennifer Garner, recently revealed it was upsetting to see him and fellow actor Jared Leto in such frail conditions on set and wanted to feed them pasta.

She said: ''It was shocking and upsetting and really hard to see ... I wanted to feed them a bowl of pasta!''