Mark Wahlberg is set to become a father for the third time, it has been claimed.

The 'Departed' actor is delighted after discovering his fiance, model Rhea Durham, is pregnant again.

A source told America's OK! magazine, "Mark is thrilled to be having another baby. He is an amazing dad, and his two children are his world. He always used to joke about wanting at least a dozen kids, but it looks like he wasn't joking after all."

The 36-year-old actor has reportedly told friends Rhea will give birth to a son in September.

Mark and Rhea, 29, already have a four-year-old daughter Ella Rae and a two-year-old son Michael. Although the couple have been dating since 2001, Mark is believed to be happy with his relationship as it is and is in no rush to get married.

Mark is currently filming 'Max Payne', in which he stars as a DEA agent who sets out to avenge his family's murder. The movie is based on the popular computer game of the same name.

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