In case you didn’t know, designers Mary-Kate Olsen and Ashley Olsen aka the Olsen Twins celebrated their 29th birthdays on June 13.

To be honest, we thought the CFDA Award winners would spend their night having a quiet, yet totally chic birthday dinner somewhere super trendy and important. We imagined they would be dressed head-to-toe in black and oversized sunnies, you know, how they do.

But to our surprise, the sisters had a Bridgehampton bash called The Olsen Olympics… and no one wore black! The Row designers split their friends into teams of two: #TeamAshley and #TeamMaryKate.

Champions ?? #teamashley #olsenolympics #twinning #sorrymk

A photo posted by Jared L. Seligman (@jaredseligman) on

We’re not exactly sure what events took place, but we do know there was a dunk tank, some sort of obstacle course and some fire. Unlike Taylor Swift, the Olsens didn’t have a backyard filled with famous celebrity friends. In fact, the guest list looked pretty low-key with folks like real estate broker Jared Seligman, stylist Becca Towler-Bolland and writer Yale Breslin.

Got #danconnor in the dunk tank, first try ? #olsenolympics

A photo posted by ALEXIS PAGE (@bikinikilled) on

Happy Birthday #TeamMK #OlsenOlympics

A photo posted by Yale Breslin (@yalebreslin) on

Everyone wore t-shirts with their respective teams, including the Olsens themselves. The girls also kept their beauty looks simple going au-naturel!

In case you’re wondering, #TeamAshley won, but let’s be honest, both MK and Ashley are winners in real life. Two clothing lines, two of the richest women in the world, and friends of John Stamos? Yep, every year is a good year for them!

What do you think of the Olsen Twins’ birthday bash?