It's the mother of the bride's worst nightmare -- tripping over your dress and falling -- and it happened to Kris Jenner!

RadarOnline.com has exclusively learned that the Kardashian matriarch got caught up in her extravagant Vera Wang dress and heels at one point after the ceremony, causing her to trip and fall.

"Luckily there weren't many people around, so it saved her some embarrassment," an eyewitness at the wedding told RadarOnline.com. "Her dress or her heels got caught on a rug after the ceremony during a sort of intermission, while Kim was doing her first dress change."

Do we smell a catfight?

Kelly Osbourne, who has suffered a very public battle with her own weight throughout her life, lashed out at her former friend Christina Aguilera recently, calling her a "fat b*tch" on E!'s Fashion Police.

After Joan Rivers commented that Aguilera looked "stuffed into" a little black Givenchy dress at a Munich event last month, likening her to "Snooki's Scandinavian cousin" Kelly chimed in: "Maybe she is just becoming the fat b*tch she was born to be. I don't know.  She was a c**t to me."

Scott Disick and Kim Kardashian are used to going head to head on the weekly reality TV show Keeping Up With The Kardashians.

But now Disick is taking their fight to another level – slamming Kim’s style on E!'s Fashion Police – and RadarOnline.com can bring you the video.

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Scott stood in for regular host Kelly Osbourne on a recent episode and when it came to grading his girlfriend Kourtney’s sister’s style, he held no prisoners!