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It was Scott Disick's 30th birthday party this weekend in Las Vegas -- but it was 57-year-old Kris Jenner who was seen lighting up the dance floor!

Scott, Kourtney Kardashian, Rob Kardashian and mama Kris all celebrated "Lord Disick's" big day on Sunday night at Hyde Bellagio.

And while there have been rumors that the birthday boy and his girlfriend/baby mama have been going through a rough patch, they looked like a cute couple on the red carpet and inside the wild party.

Scott definitely enjoyed himself, reportedly getting into the DJ booth to rap a remix of Rihanna's "Diamonds."

And then there was Kris:

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With her glass of champagne in hand, the momager was clearly enjoying herself as well.

Jenner loves her Vegas trips -- remember when she showed up at Rob's birthday party too?

Check out more photos from the bash above!

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