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Carrie Fisher and Debbie Reynolds' documentary trailer is heartbreakingly wonderful

"Bright Lights: Starring Debbie Reynolds and Carrie Fisher" is set to air on HBO Sunday, Jan. 7, and it features the actresses living side by side.
/ Source: TODAY

When the world lost Carrie Fisher and Debbie Reynolds within a day of one another at the end of December, we all knew they were beloved actresses who lived through a string of personal struggles. What we may not have been so familiar with was just how close they were.

But a new documentary finished before they both passed away (Fisher refers to needing to go to rehearsals for 2015's "Star Wars: Episode VII The Force Awakens") is now set to air on HBO Saturday, Jan. 7, and based on a new trailer, it looks like they really were two peas in a pod.

RELATED: Joint funeral for Carrie Fisher and Debbie Reynolds under consideration

"Bright Lights: Starring Debbie Reynolds and Carrie Fisher" shows the two actresses, who really did live next door to one another, pottering around the house, talking about each other and occasionally kvetching. But among it all is a lot of love.

"I'm my mom’s best friend," Fisher (whose father was singer/actor Eddie Fisher) says in the trailer. "Far more than I would ever want to, I know what my mother feels and wants."

The pair had a fractious relationship for many years, but as they grew older (Fisher was 60, Reynolds 84 at their deaths), they clearly found much in common.

RELATED: How Debbie Reynolds and Carrie Fisher healed their relationship before their deaths

"It's like the old days in a way," says Reynolds. "But I'm like the old days."

Grab a box of tissues and get ready to bawl your heart out. Maybe even with your mom.

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