"I asked. She said yes!!!" Astin wrote over the weekend, sharing a photo of him and his new fiancee wearing the same wide smile.
"He asked. I said YES!!!!" Camp captioned her post of of the same adorable pic.
The actors, who were vacationing together in Hawaii when Astin popped the question, have been dating since June 2013. This will be the first marriage for 28-year-old Astin. Camp, 33, was previously wed to fellow actor Michael Mosley; the pair filed for divorce in 2013.
Congrats to the happy couple! We can only imagine how aca-awesome the music will be at their nuptials.
Photo credit: Getty Images for ELLE