Rebel Wilson has shown off her trim physique on Instagram by sharing a rare snap with her mother and sisters.

Wilson became a household name after portraying "Fat Amy" in Pitch Perfect, however, as she entered her forties, she decided that it was time to focus on her health.

The Australian actor took to social media in January to reveal that 2020 would be her "Year of Health", and that she would be stepping up her exercise regimen and cutting down on "the sugar and junk food" as part of "some positive changes".

Now, she has shared a sweet picture of her and her mother and sisters.

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The actor took to her Instagram Stories to post the family pic. She captioned it: "The Wilson sisters."

Wilson is seen in the photo with her mother, Sue Bownds, and her sisters, Annarchi and Liberty.

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This comes after Wilson decided to clear out her snack cupboard to make sure she sticks to her healthier diet. In her Instagram Story, posted on August 30, Rebel can be seen throwing her crisps and chocolate straight into the bin.

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She even took some washing up liquid and squirted the snacks with it, to make sure she wouldn't be tempted.

"Here's the tip of the week, you get your food that you don't need, that's not good for you," she told her fans. "You put it in the bin and then you get dish washing soap and pour it on the food. So then, you can't eat it. It's gone."

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Thanking her followers on Instagram for their support on August 29, she said: "Thanks for all the love so far on my “Year of Health” journey - when I was reaching for the candies last night after dinner I thought to myself “hmmmm...better not” and had a bottle of water instead x 8kg’s to go until I hit my goal - hopefully I can do it by the end of the year x [sic]."

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Rebel Wilson shares rare photo with mum and sisters after stunning weight loss