The proposed 42 years ago, with the Brazilian model and TV presenter on Christmas Day yesterday.
The actor announced the happy news with her fans on Twitter.
He writes, "just ask Camilla to marry me, Merry Christmas."
The Lincoln Lawyer star also released a photo of the happy couple share a romantic kiss on the forehead of your Christmas tree in your WhoSay.
The movie star was born in Texas met Alves, in 2006.
The couple has two children, son Levi Alves McConaughey - who was born in 2008 - and his daughter Vida Alves McConaughey - who was born in 2010 - together.
The couple lives in the house of Austin between the state of Matthew and Malibu, but McConaughey has lived for years in a caravan nearby - to profess a love for the simple life.
The proposal may come as a surprise to Camille, who recently revealed she and Matthew have been slow to come down the aisle in the near future.
"We have no plans right now," she told the magazine OK.
"We are as we are now. We are happy and good we do. So far, so good! "
Matthew McConaughey played by Emile Hirsch Killer Joe.
The film stars Juno Temple, Thomas Haden Church, Gina Gershon, and is used by the master exorcist of William Friedkin directing.
It tells the story of 22 years, drug dealer Chris (Hirsch), you need six thousand dollars fast or is it after his mother died, his property stolen.
Desperate, he turns to Killer Joe played by Matthew McConaughey, when he learns that his mother is the policy of life insurance policies worth $ 50 000.
