Staying true to her relaxed sense of style, the model opted for a two-piece gown by Australian designer One Day Bridal. The look consisted of a structured silk-satin crop top and a high-waisted full skirt.
Smith wore her blonde hair up in a loose bun, keeping her makeup simple and natural and pairing it with a full-length veil and white bouquet.
Miller, meanwhile, chose a classic black tuxedo for the big day.
After the ceremony, Smith (who has officially changed her surname to Miller on Instagram) changed into a second bridal look for the reception, this time a slinky slip dress with white cut-outs and a thigh-high slit, which the Instagram star paired with white sneakers and loose waves.
The reception outfit was reminiscent of another famous bride, Hailey Bieber, who also opted for the 'slip-dress-and-sneakers' combo for her wedding to Justin Bieber.
Smith's best friend and business partner, Laura Henshaw, served as maid of honour, wearing a blush pink gown to see her Keep It Cleaner co-founder down the aisle.
Smith had four other bridesmaids, all of whom wore matching blush pink gowns with their hair in loose up-dos.
Congratulations to the happy couple!