Finneran, 39, was honoured with the trophy for Best Performance by a Featured Actress in a Musical for her role in Promises, Promises and she paid tribute to her partner during her acceptance speech, revealing they are set to walk down the aisle.
Dedicating the award to her beau, she told the audience, "(He) asked me to marry him."
And the actress was lucky to have Goldstein by her side to share her big moment at the ceremony in New York City - because he was due to shoot a commercial out of town.
She says, "He almost missed tonight because he had this huge commercial but I said that's fine, we both have to work, but I'm glad he's here."
It was Finneran's second Tony Award win - she previously took home a prize for her stint in 2002 play Noises Off.