Johnson-Wheeler and Mueller have been together for over six years. In 2022, Mueller shared that he went through cancer treatment. “I’m still processing what happened between getting my testicular cancer diagnosis in early summer and a final clear scan last week,” he wrote on Instagram in December that year. “I couldn’t be more thankful for all the incredible support, care and love,” he added, alongside a selection of snaps including an on-theme engraved ring and Lara by his hospital bedside. The couple got engaged one month later, on a trip to India.