"So this just happened...," The Sopranos alum wrote underneath a photo of her showing off her new engagement ring next to a beaming Dykstra. Dykstra, an infielder for the Washington Nationals, updated his social media followers shortly afterwards tweeting, "She said yes!!"
This will be the second marriage for Sigler, 31, who was married to manager A.J. DiScala from 2003 to 2006. She also dated her Entourage co-star Jerry Ferrara when they played love interests on the HBO comedy.
Sigler currently stars on the NBC comedy Guys with Kids.