Thiessen, 31, wore a Vera Wang gown and Smith was outfitted by Kenneth Cole as they exchanged vows during a daytime garden wedding Saturday.
The couple spent their first night as husband and wife at Santa Barbara's Hotel Andalucia.
The actress formerly known as Tiffani Amber Thiessen went from playing ditsy Kelly Kapowski on "Saved by the Bell" to the "90210" role of bad girl Valerie Malone in 1994. She also played a lead role in the brief Fox adventure series, "Fastlane," in 2002.
Smith has been on "ER," "CSI: Miami," "Judging Amy" and "Charmed." He recently was seen in an episode of Lisa Kudrow's new HBO series, "The Comeback."
Pregnant Mila Kunis wins 'Best Villain' at MTV Movie Awards
'Happy' fan videos make Pharrell cry [VIDEO]