Mary-Kate Olsen and fiancé Olivier Sarkozy got snuggly at a charity event in the Hamptons over the weekend.
The two attended the Paddle & Party for Pink benefitting the Breast Cancer Research Foundation on Saturday and were joined by the fashion mogul's equally as fabulous twin, Ashley Olsen.
A guest tells E! News that "Ashley arrived first, with Mary-Kate and Olivier arriving shortly after her. As soon as Mary-Kate arrived, she asked where her sister was."
Once the two siblings spotted each other at the star-studded party, they stuck together throughout the event.
"Ashley greeted both her sister and Olivier warmly, it's clear she approves of him. All three of them seemed close," our source adds.
The engaged duo spent most of the party keeping warm on a couch together and they seemed "so happy together."
"They were very lovey-dovey, a lot of PDA," our eyewitness continued. "Nothing inappropriate, but very affectionate. She and Olivier were in high spirits, laughing and chatting with Ashley."
Mary-Kate donned a signature monochromatic black ensemble, opting to keep her stunning engagement ring covered up by an oversize black overcoat.
The soon-to-be bride kept her hair and makeup simple, sporting a middle part and nude-colored lipstick.
Meanwhile, Ashley didn't miss a sartorial beat (as if she ever does!) in a hot pink blazer, black oxford blouse and delicate gold jewelry.
She rocked faded black skinny jeans and a pair of black gladiator sandals to give the ensemble a summery boost.