After almost five years as a ring girl for Jake Paul's Most Valuable Promotions, Kourtney Hartenstein is hanging up her glittery two-piece 'fits for good ... telling TMZ Sports her main focus now is more time with her family.
Hartenstein -- who is married to NBA champion Isaiah Hartenstein -- opened up about her future this week ... after initially sharing her decision with her 654k followers on Instagram.
"I need to focus on family," the 34-year-old said.