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.

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.