Prince William, Prince Harry, Princess Beatrice and Princess Eugenie took a tour of Elvis Presley's former home Graceland.
The royal siblings and cousins, who are in Tennessee for Guy Pelly and Lizzy Wilson's wedding, were seen at the singer's grand, white columned home, some of them sporting Elvis-style sunglasses in tribute to the King of Rock 'n' Roll.
William, Harry, Beatrice and Eugenie were also joined by Beatrice's long-term boyfriend Dave Clark as they strolled around the mansion and the 13.8-acre grounds where Elvis died in 1977.
Brothers William and Harry were both dressed down for the visit with the Duke of Cambridge, 31, sporting a light blue shirt and jeans and his 29-year-old brother wearing a navy T-shirt and jeans.
Beatrice, 25, wore a light-coloured shirt tucked into a skirt while Eugenie, 24, stepped out in a monochrome dress accessorised with a gold belt.
The royals are in Memphis to see their long-time friend Guy tie the knot with Holiday Inn heiress Lizzy.
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The three-day wedding celebrations will kick off on Friday with drinks at the Memphis Hunt and Polo Club, close to Lizzy's family home.
The main ceremony will take place on Saturday, after which guests are expected to attend the reception in fancy dress costume and party the night away.
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Sunday will see the extravaganza end with a lavish brunch at the club.
The group have been making the most of their US visit and were seen enjoying a private dinner with friends on Thursday night.
Scores of royal fans lined the streets outside joined at BBQ restaurant Rendezvous, hoping to catch a glimpse of the high-profile party.