The good-looking duo welcomed their two little guys, Tristan and Sasha Hemsworth, on this day back in 2014 and the actress posted a sweet photo of her hubby snuggling up to the birthday boys.
"Happy birthday my little boys, there's nothing that makes me happier in life, than being a mum and watching you grow up every day," Pataky wrote alongside the caption.
The Spanish model turned actress also added a slew of adorable hashtags to the family photo, including "#mum #boysbirthday #bestlove #party #already2 #iloveyou."
Just a week ago, the mother of three showed off one of her twin boys trying on her motorcycle helmet and seemingly wanting to go for a ride.
"My boy is ready too!" she joked before posting a shot of her "going for a ride" on the bike.
It looks like the adventurous spirit doesn't fall too far from the tree!