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Khloe Kardashian, Kendall Jenner, Kylie Jenner, Christmas Eve Party 2015

Instagram

Sisters...they're the best.

Khloe Kardashian, 31, posted on her Instagram page late on Saturday a photo from mom Kris Jenner's Christmas Eve party, showing her with sisters Kendall Jenner, 19, and Kylie Jenner, 18, whose expression is hilarious.

"Kendall and I are serrrrving and of course we have the side eye queen #CTC4Life," Khloe wrote.

The Keeping Up With the Kardashians star showed off her curvy and trim figure in a silver, sparkling Michael Costello jumpsuit, while Kendall sported a striped mini dress and Kylie wore a glittering green one from Balmain.

The teen also showed off some new bling; A huge diamond halo ring.

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A photo posted by King Kylie (@kyliejenner) on

Kylie has continued to flaunt the piece, which she has worn on the "wrong" hand, as seen in recent photos and videos posted on her Instagram, Twitter and Snapchat accounts.

While diamond halo rings have in recent years become popular choices for engagement rings as well as lavish, non-marriage-related gifts, the reality star's has, naturally, sparked engagement rumors—for the second time in three months—and especially given that her boyfriend Tyga, 26, also attended Kris' Christmas Eve party.

Kylie has denied the new rumors, adding on her website that she did receive an "extra special gift from a special someone."

A photo posted by King Kylie (@kyliejenner) on

A source had also told E! News on Thursday, after she was photographed wearing a sparking ring on her ring finger, that she and Tyga are not engaged. The source had also said the two, who recently weathered a short breakup, were "taking things a bit lighter."

Watch Keeping Up With the Kardashians on Jan. 3 at 9/8c on E!