Happy Birthday, Kris Jenner!

Happy birthday to you! Happy birthday to you! Happy birthday, Kris Jenner; happy birthday to you!

A fun time was had by all last night at Kris Jenner's 60th birthday party. All her girls were there -- Kim, Khloe, Kourtney, Kendall and Kylie -- and of course her boys Kanye and Tyga ... but we're pretty sure Rob wasn't there. Too bad he wasn't up for celebrating with his mom :(

Celebrity guests were in abundance -- Tommy Hilfiger was there, along with Will Smith, Jada Pinkett-Smith and the kids, Jaden and Willow. Kardashian BFF Jonathan Cheban posed with a pregnant Kim, who appeared to be taking it easy amid the rest of the wild revelers. A fellow pregnant woman, Chrissy Teigan and her hubby John Legend were there, as was family friend Melanie Griffith.

The Great Gatsby theme was SOOOO over the top and we love it! Everyone dressed in their finest haberdashery and flapper-wear. Lots of sequins and pin-curls and lots of fabulousness, as was expected.

A highlight of the evening, was son-in-law Kanye West taking the stage to sing his own version of "Happy Birthday" to the Kardashian-Jenner matriarch. Check it out ...