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Harry Styles, Kendall Jenner, Cara Delevingne

David M. Benett/Getty Images

Talk about a star-studded event!

There was a private party held at Hotel Café Royal in the Grill Room hosted by Kate Moss and Naomi Campell in London tonight, and guests included Kendall Jenner, Cara Delevingne, Rihanna and Harry Styles (to name a few).

An eyewitness tells E! News that gal-pals Kendall and Cara were the life of the party and stayed close to each other the whole night. They also hit the dance floor and showed off their moves to the techno music that played. 

Meanwhile, the source adds that Styles caught up with his former flings, and "flirted with Kendall a bunch." He also got up on the dance floor as well and "was the ladies man all night."

Rihanna, Naomi Campbell

David M. Benett/Getty Images

Kendall looked flawless in a strapless white jumpsuit with black panel sides, while Cara dazzled in a sparkly Burberry gown with a slit up to there. Seriously, she was dangerously close to suffering a horrible wardrobe malfunction.

RiRI showed up in a long form-fitting dress with a low cut that revealed she ditched a bra for the event. The insider tells E! News Rihanna was singing along to Beyoncé's "Flawless" and was having a fantastic time with her friends.

"She was having a blast smiling, laughing and dancing with her friends," the source said. The party lasted until around 4 a.m.

Earlier in the evening, these stars and more gathered together for the British Fashion Awards at the London Coliseum.