When you're newly engaged and walking the red carpet, you know the focus will be on the ring. Laura Prepon stepped out with her fiancé, Ben Foster [1], for The Girl on the Train [2] premiere in NYC wearing a lace column dress, but the real spotlight was on her finger. The newly engaged Orange Is the New Black [3] star discreetly showed off her sparkler as she posed for the cameras, and once we got a better look at the ring, it was simply stunning.

The round-cut diamond sits on a thin, diamond-encrusted gold band. The cut is a classic, and we're betting the newlyweds are in pure bliss. The rock also briefly reminded us of her fellow costar Samira Wiley's minimalist engagement ring [4], which the actress shared on Instagram. Read ahead to see the couple walk the red carpet together and then get a closer look at Laura's ring.

Laura Prepon Attended The Girl on the Train Premiere in NYC

She Walked the Red Carpet With Fiancé Ben Foster, Wearing a Blue Lace Dress

But All Eyes Were on Her Engagement Ring

Zoom In on Her New Sparkler From Ben