'You look amazing!' Rebel Wilson's celebrity friends go WILD over her 18kg weight loss - as she flaunts her figure in a skintight blue dress

Rebel Wilson sent fans wild on Thursday when she showed off her incredible figure in a tight blue dress on Instagram.

And now some of Hollywood's biggest stars have joined in, praising the 40-year-old comedian for her sensational new look.

'If I could like this picture numerous time I would... MY GOD WOMAN!' Australian actress Ruby Rose commented.

'You look amazing!' Rebel Wilson's famous friends have gone wild over her latest look, after she showed off her figure in a tight blue dress on Thursday 

'Sweet baby Jesus! You look amazing,' added Rebel's personal trainer Jono Castano.

'Werk. You delicious babe!' Oscar winner Octavia Spencer said, while actor Hugh Sheridan commented: 'You look so HOT!'

Rebel's Pitch Perfect co-star Shelley Regner also commented with several heart-eye emoji's and wrote: 'Magnificent!'

Olympian Rennae Stubbs wrote: 'Look at this supermodel.' 

High praise: 'If I could like this picture numerous time I would... MY GOD WOMAN!' Australian actress Ruby Rose commented

Supportive: 'Werk. You delicious babe!' Oscar winner Octavia Spencer said

Longtime pals: Actor Hugh Sheridan commented: 'You look so HOT!'

The 40-year-old, who has lost an estimated 18kg since the start of the year, had flaunted her slimmed-down figure in a tight wrap dress while attending a charity event to raise money for The School of St Jude, which offers free education to children in Arusha, Tanzania.

Rebel's viral Instagram comes after Rebel announced in January that she was going to make her health a priority in 2020.

Blue beauty! On Thursday, Rebel had showed off her slimmed-down physique in a tight blue wrap dress on Instagram . Pictured right in May 2019

'So for me 2020 is going to be called "The Year of Health". So I put on the athleisure and went out for a walk, deliberately hydrating on the couch right now,' she told her  Instagram followers.

'And I' trying to avoid the sugar and junk food, which is going to be hard after the holidays I've just had but I'm going to do it!'

In May, Rebel revealed she was trying to get down to her goal weight of 75kg (165lbs or 11.8 stone).

According to People magazine, Rebel's remarkable transformation is partially down to following the Mayr Method diet plan.

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

Kilo by kilo: The screen star revealed in May that she was trying to get down to her goal weight of 75kg (165lbs or 11.8 stone). Pictured in Sydney on July 20

The Isn't It Romantic actress has also been working hard at the gym with her trainer Jono and he recently shared her daily workout routine.  

Speaking to E!, Jono revealed that the 'results come through consistency', before explaining how he created a personalised program for the comedic actress.

During a typical week, Rebel works on high-intensity interval training, mobility, weights, resistance, technique and tempo, getting only one day a week for resting.

'Rebel and I are just focusing on enjoying training and getting the body moving,' he explained.

Pumping iron: The Pitch Perfect actress has been working hard at the gym with her personal trainer Jono Castano