From WENN.com

The Sahara star surprised the Brazilian beauty by popping the question on Christmas Day (25Dec11), and he made sure it was a moment to remember by burying the diamond under a pile of presents.

McConaughey tells People magazine, ""It was the last gift to be opened and I wrapped it in seven different boxes so Camila would have to keep unwrapping. She got the ring, I took a knee and asked her to marry me and take my name. After a bit, she conceded... thankfully.""

McConaughey also treated Alves to a vintage-style diamond headpiece and 10-carat earrings to wear on their wedding day last weekend (09Jun12).