Australian actor Alex O'Loughlin has become a father for the second time.

The Back-Up Plan star's model girlfriend, Malia Jones, gave birth to a baby boy on Thursday (25Oct12).

The newborn, whose name has yet to be released, is the couple's first child together.

O'Loughlin and Jones both have one child each from previous relationships - The Back-Up Plan star's son, Saxon, is 15, while Jones is mum to three-year-old Spike.