The actors, both 35, play Snow White and Prince Charming on ABC's "Once Upon a Time" and have announced their engagement.
The couple met while working on the show and began dating in 2011.
Goodwin was previously engaged to actor Joey Kern, while Dallas was married to Lara Pulver from 2007-2011.
On her official Twitter account, Goodwin wrote Friday, "From my soon-2-b-Mrs-Dallas head 2 my soon-2-be Mrs-Dallas-toes, I'm oh-so grateful 4 your well wishes! THANK U!"
Dallas tweeted to on his account, "Thanks to all of you for the outpouring of love and congrats!"
"Once Upon a Time" is now in its third season.
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