The couple is already parents to three-year-old daughter Everleigh Rae.
The family celebrated American Independence Day on Wednesday at Malibu Beach, California as website JustJared.com reported the news.
Cam played an evil vampire named James in the saga and the 29-year-old actor worked alongside singers Christina Aguilera and Cher in 2010's 'Burlesque'.
He also had a recurring role as Kevin Volchok alongside Mischa Barton in the teenage drama 'The O.C'.
The star can next be seen in the film 'Free Ride' with 'True Blood' actress Anna Paquin.
In the film Anna - who is currently pregnant with twins - plays a single mother caught up in the Florida drug trade during the late 1970s and tries to make a better life for her two daughters.
Meanwhile he will additionally appear in an action adventure film that revolves around the Navy SEALS who hunted and killed Osama bin Laden.
The motion picture, as well as another movie called 'Red Sky', both have cinema release dates for later this year.