Your secret is safe with me... and my best friend! Tag your besties who know everything YOU know. ‍♀️ Watch Rain Matienzo play Never Have I Ever on Cosmo's Youtube channel!

Cast of Netflix' 'The Baby-Sitters Club' Spill Group Chat Secrets | Besties on Besties | Seventeen

The After We Fell Cast Give Advice to Each Other's Characters | Besties On Besties | Seventeen

The Mani Cast Reveals Their Fave Memories Together and More | Besties On Besties | Seventeen

THIS Cobra Kai Cast Member ALWAYS Breaks Character | Besties on Besties | Seventeen

The On My Block Cast Reveals the Most Shocking Scenes to Film | Besties On Besties | Seventeen

The Cast Of 'Hocus Pocus 2' Had To Keep This SECRET For FOUR Months | Besties on Besties | Seventeen

'Never Have I Ever' Cast Play Never Have I Ever

Never Have I Ever' Cast Plays Never Have I Ever

Pop Group Triple Charm Shares Secrets Only Sisters Would Know | Besties on Besties | Seventeen

'House Of The Dragon' Stars Talk Friendships And HILARIOUS Moments | Besties On Besties | Seventeen

Kpop Group ENHYPEN Reveals SECRETS From Their Group Chat | Besties on Besties | Seventeen

K-Pop Girl Group Kep1er Reveals Which Member Eats The Weirdest Food | Besties on Besties | Seventeen

ITZY Reveals The Cutest Secrets About Their Friendships | Besties On Besties | Seventeen

Pop-Rap Duo 'Jack & Jack' RISKED Their LIVES For This Music Video | Besties on Besties | Seventeen

This Member of Big Time Rush Has *Absolutely* NO Filter | Besties on Besties | Seventeen

This 'Bel-Air 'Star Got In Trouble On His FIRST Day On Set?! | Besties on Besties | Seventeen

The Stars Of Monster High Reveal Behind-The-Scenes SECRETS | Besties on Besties | Seventeen

This Member Of ATEEZ Gets IGNORED In The Group Chat?! | Besties on Besties | Seventeen

Ginny & Georgia Stars On Real Life Age Gap And Funny Moments | Besties on Besties | Seventeen

Ariana Greenblatt Ariana Greenblatt On Barbie's Scent, Margot Robbie, And Make Up

'The Summer I Turned Pretty' Stars On Age Gap And Love Triangles

Jess Glynne Forgot Her Lyrics When Opening For The Spice Girls?!

The Joy Ride Cast Has A Blooper Reel Longer Than The Film

'The Out-Laws' Stars Nina Dobrev And Adam Devine Take A Best Friend Test

Singer-Songwriter Maisie Peters Is NOT About The Low-Rise Comeback