By Meghan Overdeep
Updated Feb 24, 2016 @ 9:00 am
Darren Gerrish/Getty Images

On Monday, after weeks of engagement speculation, Dianna Agron stepped out wearing a not-so-subtle rock on her left ring finger at Erdem's London Fashion Week show. From her front-row seat between pals Alexa Chung and Daisy Lowe, Agron's new bling wasn't easy to miss during the presentation.

The actress, 29, wore a whimsical floral dress for the event and stopped to pose for the cameras, providing a clear view of her stunning gold bezel-set solitaire ring:

Darren Gerrish/Getty Images

Although it has yet to be publicly confirmed by the couple, reports of a betrothal between the former Glee actress and her boyfriend, Mumford & Sons banjoist Winston Marshall, 27, have been swirling since the holidays.