Sydney Sweeney and Emily Ratajkowski put on quite the show in New York City … holding hands and posing together for Kérastase, a popular hair care brand.

The two stars looked glam in matching white dresses while hanging out in the Meatpacking District Friday … Sydney in a very short white dress — and, Emily matched her in a slightly longer, even tighter ensemble.

The two looked like a pair of old friends … Sydney smiling wide and Emily blowing a kiss to photographers taking pics — with huge flowers in full bloom in the background.

Sydney shared a couple flirty pics from an event to her IG too … pretending to dump hair product into a wine glass with her lips pursed in a kiss.

She captioned the photos, “enter my glossy world with @kerastase_official.”

Kérastase debuted it’s new marketing campaign with the two stars in it … going by The Gloss Girls and pushing a pop-up event in NYC scheduled for Saturday.

We broke the story earlier this week … Sydney split from her fiancé Jonathan Davino earlier this year — and, she’s been doing a lot of globetrotting recently, going on an African safari and posting pics from her vacation.