Boyle, 36, who appeared on NBC's Las Vegas, was married to Thomas, her boyfriend of 6 months, on Dec. 18, Zap2it.com reported.
"She's ecstatic ... very, very happy." said her representative, adding that the couple first met two years ago.
A tabloid magazine reported that the ceremony was very small and took place in Thomas' backyard.
Boyle played Donna Hayward in David Lynch's "Twin Peaks," as well as Monica Mancuso on "Las Vegas" and the bi-polar Melody on Showtime's "Huff."
The actress has also appeared on the big-screen in, "How I Got Into College," "Dead Poets Society," "Red Rock West," "Wayne's World," "Threesome" and "Men in Black II."