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Dave Franco and Alison Brie are engaged

Alison Brie and Dave Franco are engaged!

The "Mad Men" actress said yes to Franco, 30, after three years of dating, reports People.

The couple are reportedly very private, but Brie, 32, showed off her engagement ring on Monday at a screening for her new movie, "Sleeping with Other People" -- something we assume the two lovebirds are not doing.

Brie stars as a serial cheater in the movie alongside Jason Sudeikis, who portrays an affable player. The two try to maintain a platonic friendship, but ... well, we can see where this is going. The film is slated to hit theaters on Sept. 11.

Brie and Franco reportedly started dating in early 2012.