She posted the photo to Instagram on March 18 when the boys officially turned two.
"Happy birthday my little boys," the 39-year-old actress captioned the snap, which she also wrote in Spanish.
"There's nothing that makes me happier in life, than being a mum and watch you growing up everyday!"
She added plenty of both perfect and delightful hashtags as well, including #mum, #boysbirthday, #bestlove, #party, #already2, and #loveyou.
While Hemsworth, 32, did not share the photo on any of his social media accounts, he did wish a very happy birthday to a different party -- Twitter. The social media site turned 10 on Monday.