Posing in front of a white wall with red trim, Bella's red-and-white costume consisted of an itty bitty dress with a bustier top and white fur lining, Santa hat, gloves, striped thigh-highs and ruby velvet pumps.
While the first was captioned with a simple "Santa baby," the 19-year-old actress wrote "whoops" along with a kiss emoji beside the second pic, an over-the-shoulder shot that showed off the backside of the ensemble and quite a bit of thigh.
There was one very noticeable thing missing from the look, however --
the neon yellow tips she debuted just last month, as Bella's apparently
back to an all red 'do.
The Scream star is no stranger to posting provocative shots on social media, but this festive photoshoot is a marked difference from last year's holiday posts, when she showed off her gingerbread cookie-making skills, family pic with then-boyfriend Gregg Sulkin and her pup, and a much more covered up St. Nick outfit.
On Sunday, Bella swapped the festive attire for a stunning sheer dress covered in silver and black sequins at the Critics' Choice Awards in Los Angeles, which did just as much, if not more, to show off her curves.
She attended the show with her partner-in-crime, sister Dani Thorne, and they both met funny husband-and-wife duo Judd Apatow and Leslie Mann just moments before Bella chatted with ET on the red carpet -- and she couldn't stop fangirling over the encounter.
"I almost started crying, so I had to walk away really quickly," she admitted just moments after meeting the duo. "I went up to them, and I was like, 'Oh my gosh, I love you guys so much!' And I introduced them to my sister, and I was like, 'OK, bye!' ...Tears [don't] happen to me, and I had to get outta there."
"I never thought someone was going to bring tears to my eyes... but I love them," she added. "She looks so beautiful, and he's so fun. They're so great."