Matthew Mcconaughey's wife Camila Alves has become a US citizen.

The 33-year-old model was born in Itambacuri, Brazil, but after travelling to Los Angeles at the age of 15 to visit her aunt she decided to stay in America.

After working and living in the US for 18 years, Camila finally was granted her citizenship on Tuesday (04.08.15).

Proud husband Matthew, 45, and their three children Levi, seven, Vida, five, and Livingston, two, were present to see Camila become an American.

Taking to Twitter to post a photo of the family together at the courtroom where it was granted, he wrote: ''Congratulations Camila on getting your U.S. citizenship today - another fellow and great American. (sic)''

Camila also took to Twitter to express her joy at finally become a citizen of the US, a country she has ''so much respect'' for.

She tweeted: ''Happy to say I now hold an American passport! I have so much respect and appreciation for this country. #newuscitizen (sic)''

Matthew, 45, recently gushed about how happy he and Camila are together and how lucky he feels to be so content with his life.

The Oscar winner said: ''I get to wake up next to someone who I know loves me the way she does - my wife - who gave birth to our three beautiful, healthy children. I get to live in a nice place, and I have things to look forward to every day - work, play, and sometimes nothing at all.

''I look forward to Mondays. It's very rare to have a career where I don't need days off. I love going to work.''