Carrie Fisher's daughter Billie Lourd has paid tribute to her late mother with a heartfelt photo on Instagram.

Two weeks after Fisher died, the Scream Queens star has honoured the memory of her mum with an adorable throwback photo. It shows a young Lourd wearing bunny ears as she sits in the back of a limo with her famous mum.

"If my life weren't funny, then it would just be true and that is unacceptable," she captioned the snap. "Finding the funny might take a while but I learned from the best and her voice will forever be in my head and in my heart."

The post comes a few days after she thanked fans for their support following the death of both Fisher and the 24-year-old's grandmother, Debbie Reynolds.

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"Receiving all of your prayers and kind words over the past week has given me strength during a time I thought strength could not exist," she wrote on Instagram. "There are no words to express how much I will miss my Abadaba and my one and only Momby. Your love and support means the world to me."

Receiving all of your prayers and kind words over the past week has given me strength during a time I thought strength could not exist. There are no words to express how much I will miss my Abadaba and my one and only Momby. Your love and support means the world to me. A photo posted by Billie Lourd (@praisethelourd) on Jan 2, 2017 at 10:09am PST

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Earlier this week, Fisher's death certificate confirmed the actress died of a heart attack, but it says more investigation is needed to try to determine the underlying cause. Under "cause of death" it says "cardiac arrest/deferred".

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The Star Wars icon died aged 60 on December 27 at Ronald Reagan UCLA Medical Centre, the certificate says.

Her mother Debbie Reynolds died a day later.