The actor and girlfriend Rosalind Ross made their relationship public earlier this year
The Braveheart star first met Ross, 26, in early 2015 when she applied for a job at his production company Icon.
The pair made their relationship public at the 2016 Golden Globes.
While it will be equestrian vaulter Rosalind’s first child, it will be the Lethal Weapon actor’s ninth.
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