Nicolas Cage is set to become a first-time grandfather - his son Weston's wife is pregnant.

Danielle Cage told Closer Weekly magazine she was expecting a child during the Kasem Cares Foundation's First Annual Fundraiser in Beverly Hills on Saturday night (22Feb14).

She revealed, "It is a boy. Big boy, weighs a lot. I’m so excited! This wasn’t necessarily planned, but it is completely welcomed. We’re so happy to be giving birth eventually."

Weston Cage told the magazine that his father is thrilled about the news: "He was ecstatic. His reaction was one of pure joy and bliss. Family is very important to us.

"My father and I actually speak everyday and Danielle and I texted him the ultrasound photograph which was actually confirmation of what we thought."