The 37-year-old actress, who's currently recurring on Mad Men as Don's mistress Sylvia, was proposed to in New York City on Thursday. "I was surprised that it was happening at that moment," she said. "We were actually with some of the people I love most: my sister, and my cousins and one of my best friends Maura [Tierney], and we were sitting, and he started getting choked up and then got on his knee. It was very beautiful."
"My daughter Lilah Rose wants everyone to know that her mommy and daddy are getting married," Cardellini tweeted Friday with a photo of her engagement ring.