The former Sopranos star took to her Twitter and Instagram pages yesterday to announce the news with an image of herself and Dykstra which showed off her engagement ring.
© Instagram / @jamie_sigs
"So this just happened...." she wrote, adding two hearts to her caption.
After receiving a flood of congratulatory messages - including tweets from stars such as JoAnna Garcia and Lea Michele - the Guys with Kids actress added: "Thank you so much for all the love everyone. I am so happy and more importantly lucky!"
Dykstra also commented on the engagement on his Twitter page, retweeting Sigler's image and adding: "She said yes!!"
Sigler, who has been dating Dykstra for around a year, was previously married to her agent AJ DiScala for two years.
View all of today's best celebrity pictures - Photo gallery:
Tom Sturridge and Sienna Miller hold hands in the back of a cab after dining at Lulu's restaurant in Mayfair, London.
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