We've been anticipating Kylie Jenner's Lip Kit since before she even announced it was a thing. In August, she announced it was coming for real, and we've been been eagerly anticipating its release since then.

On Twitter, Kylie revealed we're getting closer than ever to seeing the kit IRL—it'll be out before Christmas, she says—and on Snapchat, she took us behind the scenes at a shoot for...something. Very mysterious, that Kylie Jenner.

While she didn't reveal what, exactly, she was shooting—a campaign, perhaps??—she did show off a special guest and the return of her bright green hair.

Caitlyn was on set, wearing a matching Kylie Lip Kit color. This isn't the first time the duo have worn the same lip color—they recently twinned with blue pouts for World Bullying Prevention Day.

Whether Caitlyn was on set to support Kylie or is, y'know, starring in the campaign remains to be seen, but one thing is for sure—Kylie's Lip Kit is definitely coming.