The 33-year-old wore an eye-catching black and white Carolina Herrera gown to the 69th Emmy Awards, but all attention was firmly placed on her left hand.
People reported that Goldsmith picked out a "brilliant cut solitaire set in a simple rose gold band embedded with a few more diamonds" for his bride-to-be.
And while the couple has kept quiet about their impending nuptials, Mandy's co-stars are doing the gushing for them.
"He's amazing, and she's wonderful, of course, and they're amazing together," This Is Us star Justin Hartley told Entertainment Tonight. "So anytime you can be around someone that finds happiness like that, and they found happiness in each other, I’m a huge fan of that."