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Elizabeth Olsen is engaged to actor Boyd Holbrook!

Last month it was revealed that 25-year-old actress' older sister Mary-Kate and longtime love Olivier Sarkozy were engaged to be married as well ... this fam certainly has a lot to celebrate!

The Martha Marcy May Marlene have beauty and the 32-year-old Milk actor have actor been together since 2012 after meeting on the set of Very Good Girls. "They've been by each other for a while, taking a lot of couple time," a source tells Us Weekly. "They moved into a place in Brooklyn a few months ago."

Congrats!