When it comes to celebrating holidays, celebs go all out!

Memorial Day weekend marks the unofficial start to summer 2017 — and of course, all of our fave celebs documented their lavish weekends on social media. From fun family-friendly vacations to super sexy poolside bikini parties, they all kicked back during the long weekend.

Marc Anthony spent his weekend with some very sexy arm candy! The 48-year-old Latin crooner wished his fans a happy Memorial Day weekend by posting a photo of himself lounging poolside with Italian model Raffaella Modugno — the second model he’s been linked to since his split from Shannon de Lima last December.

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But other celebrities chose to go on group trips with their other celebrity pals! Justin Timberlake and his BFF Jimmy Fallon went out for a “bro biking” trip on at tandem bike through the Hamptons while High School Musical stars Vanessa Hudgens and Ashley Tisdale rang in the unofficial start of summer with a girls-only bikini pool party.

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Bro-biking. @jimmyfallon 🚲 #memorialdayweekend

A post shared by Justin Timberlake (@justintimberlake) on

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Meanwhile, other celebs used the holiday as an excuse to show off their booties with super sexy bikini pics — and Real Housewives of Atlanta star Kim Zolciak, Keeping up With the Kardashians star Kourtney Kardashian, and Olympic skier Lindsey Vonn all take the cake!

Scroll through the gallery below to see how the celebs celebrated Memorial Day Weekend!