Rebel Wilson reveals unlikely friendship with Australian singer Amy Shark

Who knew they were friends? Rebel Wilson shows off her shrinking frame as she shares a series of playful photos with singer Amy Shark

She’s been working hard on her body transformation, already dropping an estimated 18kg through diet and exercise.

And on Wednesday, Rebel Wilson revealed her unlikely friendship with Australian singer Amy Shark. 

Uploading a series of playful photos to her Instagram, Rebel, 40, and Amy, 34, appeared to be in good spirits while they posed for the camera.

Who knew they were friends? On Wednesday, Rebel Wilson showed off her shrinking frame as she shared a series of playful photos with singer Amy Shark. Both pictured

The first photo shows Rebel standing alongside Amy, who had her arm wrapped around the Pitch Perfect star, as they posed outside Sydney’s Coogee Pavilion.

Rebel opted for comfort in a matching tracksuit set, while Amy looked chic in a blue sweater and cream coloured trousers. 

The following image sees Rebel strike a classic model pose, as she places her hands on hips and highlights her stunning weight loss.

Rebel stares into the distance as Amy captures the perfect awkward lean, while pressing down on a blue bollard. 

Fun: Rebel opted for comfort in a matching tracksuit set, while Amy looked chic in a blue sweater and cream coloured trousers. Pictured outside Sydney's Coogee Pavilion

Fun: Rebel opted for comfort in a matching tracksuit set, while Amy looked chic in a blue sweater and cream coloured trousers. Pictured outside Sydney's Coogee Pavilion

Fun: Rebel opted for comfort in a matching tracksuit set, while Amy looked chic in a blue sweater and cream coloured trousers. Pictured outside Sydney’s Coogee Pavilion

Rebel’s sighting comes after she showed off her slimmed-down frame in skintight activewear on Monday after climbing Barrenjoey Head in Palm Beach.

She shared a trio of photos to Instagram that showed her posing in blue leggings and a matching long-sleeved top from GymShark. 

The Australian star, who was joined by her friend Hayden, completed her sporty look with white sneakers and designer sunglasses.

Looking good! Earlier this week Rebel flaunted her impressive weight loss in skintight activewear after climbing Barrenjoey Head in Sydney's Palm Beach

Looking good! Earlier this week Rebel flaunted her impressive weight loss in skintight activewear after climbing Barrenjoey Head in Sydney’s Palm Beach

Rebel’s personal trainer, Jono Castano Acero, praised her in the comments section, writing: ‘Can officially say you CRUSHED MONDAY.’

The Hustle actress is believed to have lost 18kg (40lbs or 2.8 stone) since January.

According People last month, Rebel’s remarkable transformation is partially down to following the Mayr Method diet plan. 

A source said: ‘It’s an approach that eliminates food intolerances, reduces sugar, encourages eating whole foods slowly, boosts the immune system and reduces inflammation. 

Fit and fabulous: Rebel, who was joined by her friend Hayden (left), looked sensational in blue leggings and a matching long-sleeved top from GymShark

Fit and fabulous: Rebel, who was joined by her friend Hayden (left), looked sensational in blue leggings and a matching long-sleeved top from GymShark