Fifth Harmony's Ally Brooke: Left In Laughter After Epic Photoshop Fa

IT WASN'T RIGHT

Fifth Harmony's Ally Brooke is laughing off the loss of her left foot ... in what has to be the one of the greatest blunders in photoshop history.

We caught up with the singer at LAX and asked her about the group's Billboard Magazine spread ... where they inexplicably swapped out her left foot for another rightie. Check out the vid ... Brooke and our photog do a double take to make sure things are all good.

Right on.