Kim Kardashian, Justin Bieber, Kendall Jenner, Ciara and More Stars Party ...

Talk about a star-studded event!

ormer editor-in-chief of Kim Kardashian (who flaunted a gracious amount of cleavage, yet again), sister Kendall Jenner, Justin Bieber, , and Kris Jenner are just some of the celebs that got together to celebrate f Vogue Paris' Carine Roitfeld's CR Fashion Book party at The Peninsula in Paris tonight.

The beautiful group were all, of course, dressed to the nines for the Paris Fashion Week event while mingling with some of the biggest names in the fashion industry.

'They were catching up on being in Paris and when they were getting back to LA,' a source tells E! News of Biebs and Kim. 'He just met Karl Lagerfeld for the first time. They were very happy to meet each other and spoke for a bit,' the insider added.

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Bieber made sure to document his big meet-and-greet on Instagram, as well, by posting a selfie with the Chanel creative director.

Everyone also surprised Roifeld by wishing her a happy birthday. Kim, Kendall and Gigi got on stage with Carine as the crowd sang her the traditional birthday song and presented her with a gorgeous (and surely delicious) cake.

Meanwhile, Bieber's ladylove Selena Gomez was also in Paris partaking in the various festivities happening during this especially buzzworthy time. While it's unclear whether or not she also attended the CR Fashion Book party, Selena definitely glammed it up for whatever she ended up doing.

Gomez posted a beautiful selfie that absolutely glowed as she showed off her soft brunette curls, minimal makeup and a pair of diamond teardrop earrings and diamond cluster ring to her millions of followers on her Instagram page. She captioned the snapshot, 'thank you @degrisogono_official and Fawaz Gruosi for my purty jewelry #PFW .'

-Reporting by Senta Scarborough RELATED VIDEOS: