Kate Middleton and Prince William Partied on a Rare Night Out in Mustique

They're not regular parents, they're cool parents.

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If you thought royals don't know how to party, think again. Kate Middleton and Prince William reportedly let loose for a night out in Mustique—the private Caribbean island where they're currently vacationing with their family.

The couple is on the trip with their three young kids—Prince George, Princess Charlotte, and Prince Louis—and Kate's parents, but it seems they were able to get away for a bit to enjoy some time to themselves.

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The Duke and Duchess of Cambridge were spotted out for a party at Mustique's Basil Bar, which was also attended by Mick Jagger and his daughter Jade, sources told Hello! (opens in new tab). The couple is friends with the bar's founder, Basil Charles.

The Cambridges arrived "on the early side" of the soirée sporting "island chic" outfits (William wore a shirt from a local brand), according to witnesses. "They were there for the cocktails segment and kept it rather classy," a source said.

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The Duke and Duchess have been traveling to Mustique since 2008, Hello! reports, which was years before their wedding in 2011. This trip is their first time visiting the island as a family of five, as they just welcomed baby Prince Louis (opens in new tab) in April. They reportedly left for Mustique in mid-July (opens in new tab) after they were spotted at an airport in St. Lucia.

Nights out for William and Kate's might be rare (at least as far the public knows), but they also got their party fix in May after Prince Harry and Meghan Markle's wedding. At the private evening reception (opens in new tab), William reportedly had a dance-off with his father and brother, and Kate got to dance with George Clooney.

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Arriving home after the royal wedding.

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The next morning, they were seen returning to Kensington Palace (opens in new tab) wearing big sunglasses—a true sign of a night well spent.

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Erica Gonzales is the Senior Culture Editor at ELLE.com, where she oversees coverage on TV, movies, music, books, and more. She was previously an editor at HarpersBAZAAR.com. There is a 75 percent chance she's listening to Lorde right now.