Blac Chyna got a bunch of plastic surgery over the years. But her most recent operation, a "chin job", may be her most controversial one yet. She unveiled her brand new face yesterday at the Oscar's Red Carpet.

Some on social media are surprised that Chyna was invited to walk the Oscar's red carpet in the first place. But they were even more shocked, by her new face - especially her chin.

Chyna appears to have gotten a "chin job". Chin enhancement surgery, also called genioplasty, which is designed to improve the contours of the chin, neck and jawline. 

Typically, the surgery involves placement of an implant around a patient’s existing chin bone to augment the size and shape of the chin and achieve a more naturally attractive balance between facial features. 

But genioplasty can also include the doctors breaking and then re-setting the patients jawline, to achieve a more chiseled look.

When performed by a qualified, experienced cosmetic surgeon, chin enhancement can provide a permanent solution for improvement of a weak or recessed chin.

Here are some pics, showing the before and after:

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When Blac Chyna stepped out for the Academy Awards people were left wondering how she got an invite since she wasn't involved professionally with any film nominated this year.

"How tf did Blac Chyna finesse her way into the #Oscars?!" asked a user on Twitter.

"Why is Blac Chyna at the oscars?! If they're just giving invites to anyone, can I get one next year please?" questioned another.

According to her Instagram account, it was her first time at the Oscars and she was the plus one of record producer and recording engineer Christopher Trujillo aka Tito Just Music.

Chyna also reportedly avoided the Kardashian-Jenner family at the Oscars after-party because of her ongoing custody battle with baby daddy Rob Kardashian. The former couple shares a three-year-old daughter, Dream Kardashian, together.

Rob reportedly filed for primary custody of Dream in January because he has "concerns about Chyna’s partying,” according to a source who spoke to People magazine.