Is This Dianna Agron's Engagement Ring? The Star Is Sporting Some Gorgeous New Bling — PHOTO

A major congratulations is in order for one Hollywood starlet who has recently joined the soon-to-be-married club. Dianna Agron finally revealed her engagement ring after word spread the she was reportedly engaged to her Mumford & Sons singer beau. There are some pretty impressive sparklers in celebrity land, let me tell you, but this one is especially stunning.

The 29-year-old arrived at the front row of London Fashion Week's Erdem show, proudly flaunting her supposed engagement ring for the first time. The first glimpse of her rock reveals a huge circular shaped diamond set in a thin yellow gold band, and I can now confirm that it's totally gorgeous. The ring combines minimalistic simplicity, harnessing just one pure-cut diamond, with some vintage vibes emanated through the yellow and platinum color combo. Let's just say that stunning sparkler definitely stole the show.

Agron follows the likes of other stars like Emmy Rossum, Alison Brie, and Eva Longoria, who have all showed off their gorgeous sparklers lately, but Dianna's rock is especially unique. The subtle classic style with just a touch of eccentric totally fits in with her personal style, which is just the same as that.

Feast your eyes on the pretty ring.

Impressive, eh?

While there haven't been any details about the big day yet, we did a glimpse of the actress in a wedding gown.

OK so this was just for a role, but at least we got to envision her in white. Let's make some predictions on what her actual wedding dress would be like, should the engagement rumors be true, shall we?

1. Off the Shoulder

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Agron would look stunning in this ethereal off-the-shoulder Machesa gown. She has actually worn the silhouette before, so we know she is clearly fond of the style.

2. One Shoulder

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This Vera Wang one shoulder gown is simple and so pretty, and would look killer on Agron. Asymmetrical dresses clearly suit the actress well.

3. High Neck

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Can't you just picture Agron in this lace, high-neck Reem Acra? It would totally accentuate her statuesque figure.

4. Strapless

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I'm pretty much convinced the actress would wear Marchesa on her wedding day because it fits her style so well. This clean and simple strapless gown feels so right for her.

5. Sleeves

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On the other hand, I can totally see her going the princess route complete with a whimsical skirt and lace sleeves, like this stunning Monique Lhuillier.