Robbie Williams shocks fans with his dramatic weight loss by looking incredibly slim after stripping to his underpants

ROBBIE Williams has stunned fans with his incredibly slender body after stripping down to just his underpants.

The superstar singer, 49, got naked for a spray tan and his followers couldn't believe his dramatic transformation.

Robbie decided to hit the spray booth to celebrate the launch of his new Netflix documentary, Robbie Williams, which lands on the streaming service next week.

But fans only had one thing to say about the former Take That star's torso after a video of his beauty treatment was shared on Instagram.

The footage, shot and shared by his wife Ayda Field, showed Robbie standing in a popup spray booth while wearing a pair of black underpants and a cap covering his hair.

"I am having my first spray tan in over a decade," Robbie said.

Robbie, who famously stripped to 'tiger' pants for his Rock DJ music video in 2000, then tells Ayda: "Let's go. Just from the waist up. But I'm going 12 out of 12."

Once finished, Robbie cleaned his hands with a wet wipe and admitted: "It's mad how I haven't even see it and I feel better."

But commenting on the video, one follower exclaimed: "He is sooooo thin!"

Another told Ayda: "You need to feed Robbie more looks likes he's wasting away.."

A third said: "Wow Robbie I didn't realise how tiny you are and so slim."

And someone else wrote: "You have the body of a teenager how do you do that?!"

Other fans have, however, jumped to the dad-of-four's defence.

"Stop body shaming you idiots - he’s lovely," one blasted.

Another told the star: "You are perfect, just the way you are @robbiewilliams."

Robbie's spray tan video comes after he exclusively told The Sun that he is going through the "manopause".

He said he is battling thinning hair, reduced sex drive, insomnia and lethargy as he approaches his 50th birthday in February.

Robbie also confessed to having Botox. And next on his list is "Turkey teeth".

“I’ve had Botox,” he said, without moving a muscle. “I can’t get angry now. And Ayda tells me I could do a bit more. And I will."

Robbie added: "I’m also getting my Turkey teeth done — I am looking about for the people that do the best teeth. I want to see examples where you go, ‘Oh, I didn’t know you’d had it done . . .’ I don’t want TV teeth.

“I will do it and I will get a neck lift too. I’m gifting that to myself next year. There just needs a bit of help, that’s all.

“I’m going for a consultation around Christmas — my 50th birthday present to myself.”

• Robbie Williams is available to stream on Netflix from November 8. Day two of our Robbie interview is out tomorrow.