Kris Jenner Hits The Town -- And The Bottle -- On Boozy Girls Night Out Post-Split From Bruce

Kris Jenner hit the town for a girls night out on Tuesday — following her public confession that she and estranged hubby Bruce have been separated for a year — and RadarOnline.com has all the exclusive details.

Jenner, 57, hosted a birthday party at Casa Vega in Sherman Oaks, Calif. and let loose, drinking margaritas and eating Mexican food and birthday cake, surrounded by a table of girl friends.

"Kris of course, sat at the head of the table, because she always has to be the center of attention," an eyewitness exclusively told RadarOnline.com.

"There wasn't one peep about Bruce during the whole night…it was like he never even existed. She had two or three drinks, nibbled on food and shared laughs with her friends while taking pictures."

Flanked by celebrity comedian Heather McDonald, the insider says Jenner gave the birthday girl a fancy handbag which she had no problem bragging about.

"Kris was so delighted to give the birthday girl her expensive gift and went on and on about all the fine details of it and how she painstakingly took the time to pick out just the right one," the source said.

"It was just sort of weird, like the Kris show. Here it was, this woman's birthday, but Kris still had the spotlight. I don't even think she can help it at this point, it just comes natural to her."

Cameras weren't rolling for the momager's reality TV show, Keeping Up With The Kardashians, and as RadarOnline.com exclusively reported earlier, Kris wants to keep up appearances that she and Bruce are happier than ever while taping the E! show into 2015, but Bruce is over it and not only plans to file divorce papers as soon as the contract for the show is over — but wants off the show completely, as soon as possible.

Ironically, while Jenner sipped on margaritas with her gal pals, her underage daughters, Kendall, 17, and Kylie, 16, were just over the hill in Hollywood also partying up a storm — at the 21-and-over nightclub Vignette Lounge, which bills itself as “one of the most fashionable and exclusive clubs” in town.

The problem (beyond the teenagers apparently breaking the law to attend the bar) is that the club features “Wax Rabbit” on Tuesdays, “a new, voyeuristic, hip hop and nudity nightclub experience.”