The trailer is especially poignant following the deaths of Fisher and Reynolds just last week. The two-minute clip follows the special bond between the two actresses who lived next door to each other and shared everything ("especially the check," Reynolds quips).
"I’m my mom’s best friend," Fisher says in the trailer. "Far more than I would ever want to, I know what my mother feels and wants."
Fisher went into cardiac arrest aboard a plane and died a few days later on December 27. Her mother, aged 84, died just one day after.
The clip foreshadows Reynolds unexpected death, mentioning her ailing physical and mental health. Fisher jokes about her mother's memory problems and claims aging has taken a bigger toll on the Hollywood icon.
The trailer also touches on Carrie Fisher's mental health problems. The actress was always outspoken about battling bipolar disorder.
"I went too fast. I was too much. I couldn't handle it," she says as video clips play of a young and seemingly exuberant Fisher flash across the screen.
The 95-minute documentary, directed by Alexis Bloom and Fisher Stevens, was filmed between 2014 and 2015 in preparation of Reynolds receiving the Screen Actors Guild Life Achievement Award.
“We started out making a film about Hollywood royalty,” the directors said to People. “And we ended up making a film about love.”
Bright Lights will be released on HBO on January 7 at 8 p.m. Watch the trailer, below.
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