"Coming up on a year. My husband. Love you so," she captioned the snap of the two smooching. "Thanks for not saying anything about the sweet potato fries i ate in bed last night at 10 pm ..."
Matthew shared the photo as well on his Instagram Stories.
The pair met while working on Hilary's album "Breathe In. Breathe Out" in 2015. They began dating in 2017 and announced they were expecting their first child together in June 2018. Daughter Banks arrived in October of that year.
After a short engagement period, the pair wed during an intimate backyard gathering at their home in Los Angeles.
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"The ceremony started at sunset and they got married inside the house," a source told People at the time. "When the ceremony was over, guests cheered. The reception was in a white tent in the backyard," the source said. "Her sister Haylie was very involved in the wedding prep too. Hilary and Haylie are very close."