Jonah Hill just made one of the most important decisions in his life when he popped the question to his girlfriend and asked her to be his wife ... now he's got an even bigger decision to make -- which one of his celebrity friends will be the best man?!
The "Wolf of Wall Street" star is set to tie the knot with girlfriend, Gianna Santos, according to Page Six.
Hill and Santos have been dating since last summer. She's an art director and fashion stylist, who has worked on campaigns for Puma, Converse, Nike and Kith.
There are no details yet on when and where the wedding will take place, as Hill is notoriously private.
However, he will have a big challenge ahead as he chooses a best man ... and as we see it, he's got 4 big celebrities in the running to stand by his side when he says, "I do."