The hip-hop star introduced the exotic new addition to his household by uploading a snap of the baby primate on Instagram.com earlier this week (begs15Dec13).
Alongside the picture, which shows the monkey wearing a diaper and hugging a blanket, Montana wrote the caption, "This s**t funny when I get high and see I really got a monkey (sic)."
He went on to upload more snaps of the mammal, which he has called Julius Ceasor, inspired by Roman emperor, Julius Caesar. One shot was of the monkey sitting on his shoulder while they travelled aboard a private jet.
Earlier this year (13), Bieber landed in trouble with German officials after he attempted to enter the country with his pet monkey, Mally, without the correct paperwork. He failed to reclaim the primate, which was subsequently placed in a European zoo.