Fetty was hired by MSC Industrial Supply CEO Erik Gershwind and his wife, Jackie, to perform Saturday in NYC for their kids' B'nai Mitzvah -- a dual Bar and Bot Mitzvah for a brother and sister.
The Gershwinds didn't spare any expense on the shindig either. TMZ was told they spent $150k for FW to do four songs, and they had a ton of good grub going around ... including a sushi bar, sirloin steak with bordelaise sauce, salmon on toast and even a pretzel machine.
As for the mini concert itself ... Fetty made sure to keep it PG-13 for the kids. TMZ was sure the parents were happy about that ... Mazel Tov!
Photo: AOL