Sydney Sweeney must be feeling euphoric as her budding lingerie empire continues to soar.

The “Euphoria” star’s intimates label, SYRN, has experienced its strongest quarter since launching, with record-breaking sales, sold-out collections and growing consumer demand, a source exclusively told Page Six.

According to the insider, the brand doubled its sales in the third quarter compared to the second, while September became its biggest month ever, generating more than three times the sales recorded in June.

The company estimates that September sales could have quadrupled June’s figures had several popular styles not sold out ahead of schedule, highlighting consumer demand that exceeded available inventory.

The momentum accelerated with the launch of Sweeney’s Birthday Boobs collection, which delivered SYRN’s biggest sales day in company history.

The launch generated more than $2 million in sales, with the collection selling out within a single day, according to the source.

And the growth shows no signs of slowing.

October is currently on track to deliver an additional 20 percent increase in sales compared to September, potentially setting another monthly sales record for the emerging lingerie brand.

The impressive numbers come as Sweeney continues to generate buzz with her promotional campaigns, including her latest holiday collection, which puts a cheeky spin on several Christmas classics.

As Page Six previously reported, the actress channeled “Home Alone” and Cindy Lou Who from “How the Grinch Stole Christmas” in the festive campaign, which also featured sultry lingerie looks inspired by the “Corpse Bride” and “White Christmas.”

Beyond the sales growth, SYRN is showing signs of becoming a meaningful new player in the intimates category.

The brand is tapping into a combination of Sweeney’s cultural influence, direct consumer engagement and a growing appetite for lingerie that blends playful design, confidence and accessibility.

With its strongest sales period yet and several successful product launches, SYRN is entering its next chapter focused on expanding its product assortment, strengthening inventory availability and building a lasting consumer brand.

What began as a celebrity-founded label is increasingly positioning itself as a standalone fashion business with an identity of its own.

A representative for Sweeney did not immediately respond to Page Six’s request for comment.