When Taylor Swift is a guest at a wedding, it’s easy to guess whose dress is the second most talked-about (after the bride’s of course). In this case, the wedding was for Swift’s longtime friend and producer Jack Antonoff to actress (and Chanel ambassador) Margaret Qualley. The wedding took place in a New Jersey beach town and based on the photos I’ve seen, I’d call it a classic, semi-formal affair—and Swift dressed accordingly, opting for a light blue lace midi dress by Erdem (which is now on sale, but it’s going fast).

The romantic dress, with its corsetted bodice and ruffled skirt, is as perfect for a wedding as it gets. And while there are many trend-forward elements to Swift’s dress, it’s the balconette detail that makes the most impact, in my opinion at least. Balconette dresses feature bra-style cups (often underwire), and it’s a pretty, lingerie-inspired trend I’ve seen a lot of as of late. I can tell that people love it because dresses of this style are often very quick to sell out.

Scroll on to follow Swift’s lead and shop the pretty balconette dress trend for yourself.

On Taylor Swift: Erdem Melora Dress ($2937)

Additional sizes are available here.