The 36-year-old actress is already mother to 10-month-old Torin Mathias with husband Grant Turnbull and shared the happy news of an impending arrival alongside a snap of the tot wearing a "World's Greatest Brother" T-shirt.

“#TorinTheChief excited about his upcoming role of big brother!" Nadia captioned the picture, which she shared on Instagram on Saturday (11Mar17).

Grant later shared the same picture, alongside the caption: "Baby Bull #2 debuting August 2017... #worldsgreatestbrother #lovesofmylife #brothers #babies."

Nadia and Grant met by chance on Valentine's Day in 2014, and wed in Palm Springs, California, in May, 2015.