By Kayla Kibbe If there’s one thing the stars can agree on these days, it’s that butt-bearing loungewear is in. After Rihanna ushered in the holiday season late last year with the gift of assless tartan pajama pants, Kim Kardashian has raised her a crotchless catsuit complete with ample butt cleavage. The now officially single megastar debuted her latest Skims release on Wednesday, modeling the sleek yet sexy (yet also kind of confusing) design for the brand’s Instagram. Naturally, Kardashian’s foray into crotchless catsuits (a first for the brand) sparked plenty of questions among fans wonder…