The couple tied the knot in a super-romantic ceremony in California on Saturday (September 13).
The happy news was confirmed to Us Weekly.
A statement from the newlyweds said: "What a perfect way to start our lives together, surrounded by the people we love most."
Among Lauren's bridesmaids - who all wore dresses from her own fashion label Paper Crown - was her former The Hills co-star Lo Bosworth.
Reality TV star Lauren, 28, first met William, 34, on Valentine's Day in 2012, after being set up on a blind date by mutual friends. They got engaged in October 2013, after William popped the question with a stunning round cut diamond engagement ring.
At the time, former Laguna Beach star Lauren gushed: "I am very excited to share with you guys that William and I got engaged over the weekend. I am beyond thrilled!"
She enjoyed a four-day bachelorette party with her closest girlfriends in Mexico in June.
A few weeks ago, Lauren gave fans a sneak peek of her wedding shower, complete with gorgeous gold plated cutlery, and personalised napkins reading "Almost Mrs Tell".
A huge congratulations to Lauren and William!
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See the other celebrity couples who have wed in 2014:
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