"Got my first haircut in years!" she captioned the selfie, which shows off her shoulder-length, California beach blonde waves.
Lauren recently opened up about married life with William. "It doesn't feel too different," Lauren told Us Weekly. "We felt married before we were actually married."
Pointing to his new wedding band, Will, 34, added: "I could get used to this."
The newlyweds, who first met on Valentine's Day in 2012 and started dating soon after, kicked off their honeymoon with a romantic getaway in Sicily, Italy.
The pair travelled around the countryside, taking in the breathtaking
landscape , with Lauren revealing that her favourite part of the island
was the food.
"We just had amazing meals everywhere," she said. "We rented a car and drove around, it was a beautiful place."
Lauren shared one of her most memorable dinners with her 3.6million fans on Instagram, posting a photo of herself holding up a gargantuan pizza and sipping a glass of red wine. "Post wedding diet," she captioned it.
The former The Hills star, 28, looked to be having the time of her life as she wrote alongside another snap of an Italian phrasebook, "How do you say 'I may never come home?'".
Lauren and Will then travelled to Santorini, Greece for the second part of their European honeymoon.