Stassie Karanikolaou

Olivia Gail O'Brien (born November 26, 1999) is an American singer.

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Bikini Queen! See Stassie Karanikolaou’s Best Bathing Suit Photos Over the Years

Kylie Jenner's pal Stassie Karanikolaou and beau Jaden Hossler hold hands after enjoying a double date with Justin and Hailey Bieber

Kylie Jenner's pal Stassie Karanikolaou, 26, almost spills out of her dress as she takes beau Jaden Hossler, 22, to the Victoria's Secret event

Kylie Jenner's pal Stassie Karanikolaou models a VERY plunging dress as she joins Emily Ratajkowski and Julia Fox at PrettyLittleThing show

Besties for Life! Looking Back at Kylie Jenner and Stassie Karanikolaou’s Friendship Timeline

Kylie Jenner and Stassie Karanikolaou Kissing ‘Isn’t a New Thing’: See Their Smooches in Photos

Besties For Life! Meet All of Kylie Jenner’s Best Friends, Including Stassie Karanikolaou and More

Kylie Jenner Says She ‘Always’ Makes Out With Stassie Karanikolaou: ‘A Lot of Best Girlfriends Do That’

Kylie Jenner Addresses Rumors She Hooked Up With Stassie Karanikolaou

Stassie Karanikolaou celebrates turning 26 with her BFF Kylie Jenner her loved ones

Kylie Jenner cuddles up to best friend Stassie Karanikolaou as she celebrates pal's 26th birthday

Kylie Jenner's lookalike BFF Stassie Karanikolaou parades her slimmed down look at Cannes gala

Kylie Jenner's BFF Stassie Karanikolaou reveals her beach day beauty secrets

Kylie Jenner's BFF Stassie Karanikolaou flaunts VERY tiny waist in a skintight workout

Stassie Karanikolaou’s Swim Collab With Cupshe Will Make You Feel ‘Confident’

Stassie Karanikolaou's Swimsuit Collab Delivers Viral Fashion Moments

Kylie Jenner’s BFFs Stassie Karanikolaou and Victoria Villarroel Rock Thong Bikinis in Mexico

Kylie Jenner Kisses BFF Stassie Karanikolaou on Valentine's Day Amid Break From Travis Scott

Kylie Jenner's BFF Stassie Karanikolaou puts on busty display in a tank top during MTV Cribs shoot

Stassie Karanikolaou shares new snaps with BFF Kylie Jenner and boyfriend Jaden Hossler