Cara Delevingne is set to splash out £100,000 on a girls-only birthday trip to Mexico

A source said: "The Mexican premiere of 'Valerian' marks the end of the movie's promotional tour so Cara has, very generously, decided to fly out 20 of her best girlfriends for the adventure of a lifetime.

"She's invited all her closest friends, including Kendall Jenner, Suki Waterhouse, Georgia May Jagger, Jamie Winstone, and, of course, her older sisters Chloe and Poppy."

While a number of the women-only group enjoy sharing bikini selfies on social media from time to time, this holiday will be a lot more action-packed as Cara - who turns 25 on August 12 - has lined up a host of exciting activities for her and her pals.

The source added to MailOnline: "The girls will be trekking in the rainforest, kayaking and going on excursions to sample the varied wildlife of the region ... all finished off with a massive party to celebrate Cara's birthday at the end.

"It's a girls-only trip and Cara wanted to celebrate a busy few months of hard work and get away from it all as much as possible with those closest to her.

"It's going to be an incredible trip."

The birthday bash won't be the only big spend Cara has made recently as she and sister Poppy Delevingne forked out a whopping £1.56 million on the former Hollywood Hills abode of Cara's 'Suicide Squad' co-star Jared Leto earlier this month.

A source said at the time: "Cara and Poppy are both spending more and more time in LA, and decided the time was right to have a base out there.

"Being so close, the idea of sharing a house seemed a natural step and they're really excited to get hold of the keys and bring their own vibe to the place."