However, Meghan wasn't the only high-profile wedding guest who opted for a black ensemble for the fashion designer's wedding.
She and Harry took off for a rare baby-free trip on Thursday to attend the wedding of her close friend and designer Misha Nonoo and enjoy a romantic minibreak before their royal tour of Africa begins on Monday. She accessorised with a rose gold clutch, diamond earrings and her hair styled in Hollywood-style waves with a side parting.
The pop star finished off her look with some chic white sunglasses while her fiance Orlando Bloom looked dapper in a tuxedo.
The lavish Villa Aurelia is one of the most sought-after and exclusive wedding venues in Rome, boasting elaborate interiors, extravagant reception rooms and breathtaking views of the city.
Meghan Markle Looks Gorgeous in Sheer Navy Dress at Misha Nonoo's Wedding
According to a royal source, Meghan and Harry "hope to" give fans a glimpse of their son during the tour, but baby Archie has not been included in the official schedule.
Nonoo recently collaborated with the duchess on her Smart Set capsule wardrobe for the Smart Works charity.
Meg and Harry were reportedly introduced through Nonoo.
Meghan Markle plans to speak out about violence against women when she visits South Africa next week, according to a new report.
Prince Harry and Markle - who was dressed in a navy tulle Valentino gown with crystal details - were joined by a host of celebrity guests, including Katy Perry, Orlando Bloom, Karlie Kloss, James Corden, Jared Kushner and Ivanka Trump.