Kim Kardashian celebrates big birthday Las Vegas style

Older sister Kourtney rallied her gaggle of gal-pals in a mission to loosen Kim up for the glitzy Sin City festivities, in scenes aired on Sunday night’s episode of Kourtney And Kim Take New York.

The curvy socialite was not happy about hitting 30, telling viewers: “This is really freaking me out, it’s making me feel so old and so weird.”

She showed off her eye-popping cleavage in a skintight silver dress for her main Vegas bash at club Tao but failed to get in the full party mood.

“I hope she loosens up with age,” said pal Jonathan Cheban. “She’s always so uptight.”

But Kourtney, 31, soon snapped her out of it by making Kim swig from a beer keg upside down during a special 'frat party' held the following night.

“I don’t drink beer,” insisted Kim, telling viewers: “The whole college keg thing seems really stupid to me”.

After watching her mother Kris Jenner do a hilarious keg stand, Kim told viewers: “I can’t even deal with it, there are no words.”

But soon it was Kim’s turn and despite her protests, she tied her famous glossy locks back and rolled up her sleeves.

She was held almost vertically by the group, which included younger sister Khloe, as she spluttered beer all over the floor before collapsing into a fit of giggles.

“Thank you so much, guys,for making this so much fun and teaching me that there is life after 30!” Kim told her pals, as they toasted her birthday.