Kim Kardashian‘s signature ass-ets have disappeared!

The reality starreunited with former BFF *Paris Hilton** — HOLY COW! — at mama Kris Jenner‘s Christmas party over the weekend, but in the Instagram photo, it appears as though Kim has lost her signature butt.

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“Lovely celebrating the holidays with Kim,” Paris captioned the photo. Shortly after the pic was shared, fans speculated Kim’s recent social media hiatus was due a butt augmentation.

“Seems like she left the spotlight to get surgery done,” commented one fan, with another adding, “Her butt looks smaller than it did before.”

Even so, it’s nice seeing the mother-of-two out and about, especially considering recent events. Following her armed robbery and husband Kanye West‘s emotional breakdown, the couple’s marriage is in horrible shape. In Touch previously learned the brunette beauty has been seeking the advice of famed divorce attorney Laura Wassar. To make matters even worse, the meetings have been happening behind Kanye’s back.

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“[Kim] really thought Kanye was her soul mate and is absolutely devastated,” a source confessed, adding that she’s been “miserable” in their marriage. “Kanye has absolutely no idea that any of this is happening, but Kim has already asked to have divorce documents drawn up. An announcement could happen at any time. She’s been doing everything in top secret.”

The 36-year-old has also been quietly suffering from “severe fibroids,” which may lead to her needing a hysterectomy in the future.

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(Photo Credit: Getty Images)

“She’s been warned in the past they could eventually result in surgery to remove her uterus,” a source previously revealed. “Fibroids can cause you severe pain and lead to complications such as anemia and blood loss. They cause her such severe pain and cramping, sometimes she just wants to stay in bed.”

Scroll through the slideshow to see more photos from the annual Kardashian Christmas party!