Matthew McConaughey has revealed he and wife Camila Alves are keeping the sex of their new baby a secret – even from themselves.

The Magic Mike star and Brazilian model Camila – who already have a daughter, two-year-old Vida, and son Levi, three – announced they are expecting their third child together, just a month after tying the knot.

Matthew revealed: “We don’t know (if it’s a boy or a girl). We didn’t find out with the first two and we won’t find out with this one.”

The 42-year-old actor plays a male stripper in Steven Soderbergh’s new film Magic Mike.