There's two back-to-back lines in the new trailer for HBO's Bright Lights: Starring Carrie Fisher and Debbie Reynolds that pull together their mother-daughter relationship.

"I'm my mom's best friend," Fisher says.

"I share everything with my daughter," Reynolds says, before adding, "especially the check."

The new movie documents their undeniable friendship as Fisher and Reynolds live side-by-side, and by watching the trailer, released Wednesday, their back-to-back deaths in December seem less coincidental.

The 95-minute doc will air on HBO on January 7 at 8 p.m. ET, so prepare the tissues.