Stassie Karanikolaou flashes taut midriff in high-cut skirt ahead of 24th birthday

Kylie Jenner puts on a busty display in cozy Instagram video with BFF Stassie Karanikolaou

Stassie Karanikolaou sizzles in patterned catsuit at Kendall Jenner's 818 tequila party in LA

Kylie Jenner wraps up in black overcoat as she heads out on the town with pal Stassie Karanikolaou