Megan Fox took to social media on Thursday to share an adorable first photo of her third child. The Teenage Mutant Ninja Turtles star and her husband Brian Austin Green welcomed their newborn son Journey River Green in Los Angeles on 4 August.

The photo — without a caption — shared by the 30-year-old actress on Instagram shows the mother and her three-month-old son staring at the camera while lounging in bed. The couple are also parents to four-year-old son Noah Shannon and two-year-old Bodhi Ransom.

The actress announced her pregnancy when she attended the Cinema Con in Las Vegas to promote her film Teenage Mutant Ninja Turtles: Out Of The Shadows in April. The news surprised many of her fans as she had filed for divorce from Green in 2015. At the time, rumours were in overdrive over who the father might be but she quashed the rumours as she shared a collage of photos with other actors with the caption: "#NotTheFather."

According to People, the couple reconciled after Fox filed for divorce.

"Brian and Megan are living together in Malibu with their boys. They have been getting along and seem very happy," a source told the celebrity magazine in July.

"During their separation, Brian always hoped Megan would change her mind about the divorce and he is very happy that she did. They both worked hard to figure out their marriage and things seem great," the source added.

Fox and Green were "reconsidering the divorce" because "they don't want their kids to grow up in a broken home," another source previously said.

The couple got married in 2010 and have been together for over 10 years.