Sydney Sweeney showed up to Glen Powell's sister's wedding over the weekend, and it's been a whole thing. Mostly due to the internet (incorrectly) assuming that Sydney and Glen are dating now that she's single. But also because of Sydney's dress choice.

She was photographed wearing a plunging dress with the thinnest of spaghetti straps and a sheer corseted bodice with exposed boning. The most controversial element of the dress, however, was the gown's colour as it was an ice blue hue that's pretty close to white.

Check it out for yourself:

There's no denying Syd looks gorgeous in the wedding guest dress, going seemingly sans accessories with her hair styled down in loose ringlets and opting for a minimal no-makeup makeup look. Though we'd argue she's never *not* stunning, see her recent safari chic holiday wardrobe for proof.

Naturally – as with many celebrity wedding guest dressing dramas (we're looking at you Lana Del Rey, Kendall Jenner and Kim Kardashian) – it's started a whole thing online. Luckily, Sydney's fans were ready to go to bat for the star on behalf of her sartorial choices:

A couple things to note! First of all, the dress is blue not white, and this photo is definitely brightly lit which could be lightening the fabric.

Everyone's clicking on...

But more importantly, it looks like Glen's sister asked her guests to wear ice blue. At least based on this photo of everyone on their way to the wedding:

There's no denying that choosing an appropriate wedding guest outfit isn't always as straightforward as it should be. No worries, we've got you covered with what you definitely can wear to a wedding plus what not to wear, too. You're welcome!

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Mehera Bonner is a celebrity and entertainment news writer who enjoys Bravo and Antiques Roadshow with equal enthusiasm, She was previously entertainment editor at Marie Claire and has covered pop culture for over a decade.