Hailee Steinfeld and Josh Allen are engaged ... announcing the news in a romantic Instagram post on Friday.
The actress and the Buffalo Bills QB posted a photo of Allen down on one knee asking Steinfeld to marry him with a beautiful sunset coloring the scene, framed by a gorgeous flower arch.
Hailee leans down and plants a kiss on Josh's mouth in the snap ... with the caption reading "u267eufe0f 11•22•24 u267eufe0f" -- indicating he popped the question one week ago.