Palmer and Webber, 36, are already parents to two-year-old Bodhi Rain.
The actress has regularly documented her pregnancy on Instagram.
The couple have been married since 2013.
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Australian actress Teresa Palmer has welcomed her second child with husband, Mark Webber.
The Hacksaw Ridge star, 30, took to Instagram to announce the arrival of her newborn son.
"Our sweet littlest love is here 🙏 Forest Sage Palmer was born yesterday in Adelaide on 12/12 at 12:18pm weighing 8lb 4oz and 20 inches long! Our hearts are so full and blessed 🌲✨"
Palmer and Webber, 36, are already parents to two-year-old Bodhi Rain.
The actress has regularly documented her pregnancy on Instagram.
The couple have been married since 2013.
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