The couple made the announcement via Instagram with a cute pic of the pair cuddling in the backseat of a car while Camp holds up a sizeable diamond on her left hand.
"I asked. She said yes!!!" Astin captioned the original photo. Camp re-grammed the same snapshot with the caption, "He asked. I said YES!!!!"
The two starred in the 2012 surprise hit film and started dating in June of 2013. Camp was previously married to actor Michael Mosely, whom she divorced that same year.