Matthew McConaughey has admitted he's "vain."

Speaking in the November issue of GQ magazine, he explained: "I am vain. I think vanity is a good thing. It's done more good things for me than it has not."

Meanwhile, the actor recently praised his wife Camila Alves and their children Levi, six, Vida, four, and Livingston, two, for supporting his career.

He said previously: "I try to give a lot to my life and the people in it, and I know they sure give back. I have a lot to be thankful for.

My life outside my career is extremely enriching. So I am letting that feed my work, and letting my work feed my life."

Richard Linklater - who gave Matthew his breakout role in the 1993 film 'Dazed and Confused' - agrees that Camila's support has been a big factor in her husband's transitioning career in recent years.

He said: "[In Hollywood] you'll have people around you who want other things [for you], but she will approach it as, 'What does Matthew want?' That's the direction she pushes him."

Matthew and Camila have enjoyed a two-year marriage since tying the knot in 2012 after six years together.