Ralph hosted a show and a gala dinner at the Bethesda Terrace fountain in Manhattan's Central Park in New York City at the weekend as part of New York Fashion Week to celebrate the landmark anniversary.
The star-studded guest list included Anne Hathaway, Blake Lively, Steven Spielberg, Tom Hiddleston, Lily Aldridge, Jessica Chastain and Rosie Huntington-Whiteley among others and many of them took time out to praise Ralph, 78, for his achievements in the fashion world.
'Molly's Game' star Jessica, 41, recalled a story Ralph told her about starting out as a young designer in the city and insisted his ascension to the top of his profession encapsulated what the American dream is.
She said: "The 50th anniversary of Ralph Lauren and how wonderful to be in New York because I remember he told me a story about how he began in New York City making ties. You know his clothes remind me of, they have such an American feel to them, but he really is the epitome of the American Dream when you think about it so it's beautiful to be here in Central Park."
'The Shallows' actress Blake, 31, thought the best part of the event was Ralph's family reaction to his historic collection and the love they had for each other.
She said: "The collection was just one of the most stunning collections I've ever seen and the most beautiful part was seeing Ralph's family and seeing Ralph's family looking at him.