The Serbian player, who celebrates his 30th birthday today, is ranked No. 2 in men’s singles tennis.
The Duchess of Cambridge wore a Christopher Kane coat and Gianvito Rossi heels at the royal family’s first garden party of the summer.
The U.S. president, along with wife Melania and daughter Ivanka, will spend two days in the Italian capital.
The star is set to perform tonight at the Billboard Music Awards.
The performance went viral.
The 71-year-old is the 2017 Billboard Music Awards Icon honoree.
Gucci loafers and studded Louboutins are included in their wardrobe.
The Duchess of Cambridge will attend her sister’s wedding with husband Prince William and their kids, Prince George and Princess Charlotte.