The 67th Cannes Film Festival
Cara Delevigne has been friends with Prince Harry for years Reuters

It's a known fact that Cara Delevingne has friends in high places and is famously part of Taylor Swift's glamourous squad comprising models, movies stars and chart-topping singers. And while the 23-year-old has a royal connection – her grandmother was lady-in-waiting to Princess Margaret – her latest claim to fame is that she is known to drunk-text Prince Harry.

Cara and Prince Harry, who have been friends for several years, are both well-known for their party-loving ways. And as Cara's Suicide Squad co-star Margot Robbie revealed, the model and actress is so familiar with the young royal that she is not averse to sending Harry the occasional alcohol-induced text.

Describing her attempt at one-upmanship with her co-star, Robbie told Mail Online: "We just talk about regular girl stuff. She is like 'I've had sex on a plane' and I'll be like 'yeah, but I've had it on a jet ski'. And she will then blow me out of the water and tell me she 'drunk texts' Prince Harry. So I'm just like 'okay, you win'."

Robbie, who became acquainted with the Prince through Cara, recently revealed that she also has Prince Harry's phone number. And while they often communicate via text she admits she's not always as quick to reply as he is.

"He's pretty quick on text actually," the 26-year-old actress told Extra at the New York premiere of Suicide Squad. "Unlike me — I write back four days later, weeks later sometimes."

Prince Harry
Prince Harry in the party mood with cousin Eugenie, Sienna Miller, Margot Robbie, Suki Waterhouse and Cara Delevigne Instagram

Last year (2015), pictures emerged of the Prince oparty mode with Cara, Margot, Sienna Miller and his cousin Princess Eugenie at Suki Waterhouse's home during a festive Christmas gathering.

They were also caught on camera larking around in a photo booth, pulling silly faces for the camera while the Prince donned a pair of oversized glasses as he posed with his glamorous posse.