Princess Charlene of Monaco, who had been away from public life for months due to health issues, has tested positive for Covid-19, the palace said in a statement.
The 44-year-old former Olympic champion, who married Prince Albert in 2011, returned to Monaco in March as her health improved, the royal palace said at the time.
She only recently resumed official duties, having attended the Monaco Grand Prix just last month, after and the palace said there were no concerns about her condition and she would isolate where appropriate according to health protocols.
The positive test comes a day after France's Public Health Authority said it had seen a rebound in cases this week for the first time in months with a seven-day average of about 20,000 daily cases.