Machine Gun Kelly is ready to "Lace Up" for the All-Star Celebrity Game ... 'cause the Cleveland rapper/rocker just gave a glimpse of his 3-point shot during a recent shooting sesh ... and the dude's looking like a taller Darius Garland!!
The award-winning rapper is taking his spot in the All-Star festivities VERY seriously ... and has been training with NBA shooting coach Chris Matthews -- AKA the "Lethal Shooter" -- leading up to the game.
Matthews posted a video of MGK's shooting skills on Instagram .