Charlotte Casiraghi (R) and her partner French writer Nicolas Mathieu attend the match opposing Italy's Jannik Sinner and Czech Republic's Tomas Machac during their Monte Carlo ATP Masters Series Tournament round of 16 tennis match on Court Rainier III at the Monte-Carlo Country Club in Roquebrune-Cap-Martin, south-eastern France on April 9, 2026. (Photo by Valery HACHE / AFP via Getty Images) / / NO TABLOIDS WEB & PRINT, NO DAILY MAIL, NO DAILY MAIL GROUP, NO VOICI, NO CLOSER