Justin Bieber Engaged

Justin Bieber popped the question to Hailey Baldwin Saturday night ... so claim 2 eyewitnesses.

The 2 women who say they saw the engagement go down claim it was at a resort in the Bahamas.  They say everyone was at a restaurant on the property doing salsa dancing when Justin's security told everyone to put their phones away, because something special was about to happen.

They say Justin then proposed in front of everyone.

Another source with knowledge of the situation also tells TMZ Justin and Hailey got engaged Saturday night.