Theranos founder Elizabeth Holmes is engaged, Vanity Fair's Nick Bilton reported.
Her fiancé is William "Billy" Evans, a 27-year-old hotel heir, according to the Daily Mail. Evans has also worked for driverless-car startup Luminar Technologies.
"She wears his M.I.T. signet ring on a necklace and the couple regularly post stories on Instagram professing their love for each other," Bilton wrote in a February Vanity Fair article. "She reliably looks 'chirpy' and 'chipper.'"
Holmes and Evans have reportedly been living in a luxury apartment building in San Francisco while Holmes awaits trial. Holmes, 35, was once a Silicon Valley superstar and the youngest female self-made billionaire after founding the blood-testing startup Theranos. But when the flaws and inaccuracies of the company's technology were revealed, Theranos and Holmes were charged with "massive fraud."