Escorted by husband Bill, the former US Secretary of State beamed as she arrived for the lavish nuptials, which was also attended by singer and actress Jennifer Lopez and daughter of US President Donald Trump, Tiffany, according to reports.
Hillary wore a beautiful blue flowing kaftan to the event, which she paired with striking silver kitten heels, while husband Bill opted for a simple black suit and black tie.
The unusual choice for the normally pant-suited politician marks a notable departure from her signature structured silhouettes, with this softer style showcasing an altogether lighter and brighter look for the former FLOTUS.
All eyes outside the event were also on superstar Jennifer Lopez as she arrived for the bash in a show-stopping jewel toned Hamel gown with plunging neckline and long train.
The singer accessorised her glamorous green gown with heavy gold statement bangles, large hoop earrings, gold platform sandals and a glittery clutch box purse.
Her boyfriend of four months, baseball player Alex Rordriguez looked dapper in a black tux and sunglasses in a photo the singer posted to Instagram with the caption "Just another Sunday night".
Attending the wedding of a friend's daughter, Hillary Clinton traded her signature painsuit for a summery blue caftan. #BazaarLoves #HillaryClinton . . . . . . . . . . #fashion #fashioninspo #styleinspo #fashionstyle #fashionlook #fashionlove #blue #caftan #summerstyle #fashionstyle #wedding #bazaarvietnam #harpersbazaar #harpersbazaarvietnam
The glamorous guests were attending the Wall Street-based wedding of Sophie Lasry, the 24-year-old daughter of billionaire hedge-fund manager Marc Lasry, and 25-year-old Alexander Swieca, the son of fellow billionaire hedge-fund manager, Henry Swieca, according to the Daily Mail.
The nuptials took place in NYC’s opulent Cipriani Wall Street, which once served as the New York Stock Exchange and the United States Customs House and is most recognised for its Greek revival architecture.
Clinton and Lopez are already well acquainted from former events, including just last year when J-LO showed her support for the US Democratic Party presidential candidate by headlining a concert for her campaign.
The women were photographed together after the singer and actress performed for a Get Out the Vote event in Miami in October last year.
Lopez was joined at the concert by ex husband Marc Anthony, with whom she shares two children - twins Emme and Max.