By KIRSTY MCCORMACK
Entertainer: Robbie Williams shocked Gary Barlow and his hopefuls by wearing a palm leave costume similar to Sinitta's back in 2009
He's no stranger to showing off his body, but Robbie Williams took things to the next level when he joined X Factor judge, Gary Barlow in LA this month.
Wearing nothing but a nude pair of boxers, pulled up socks and a total of six palm leaves, the Take That star shocked Gary and his male contestants as he made his entrance and struck a pose.
Making a reference to eighties star Sinitta's appearance on the show in 2009, when she helped ex-partner, Simon Cowell whittle down his hopefuls, Robbie looked baffled as Gary held his face in his hands.
Ashamed: Gary Barlow covered his face whilst laughing at Robbie's interesting outfit
'I saw Sinitta in it and thought, that’s what I want to do! What do you reckon lads?!' he said.
The eight pop star wannabes looked delighted to meet the Take That star - even if he was showing a bit too much flesh - with Marcus Collins replying: 'For a minute I genuinely thought it was Sinnita!'
The judge earlier told his group of guys that he was excited to be there with them.
'I'm so excited about the songs and the performances, but I think what you're all excited about right now is who’s here with me!
Stunned: The hopefuls not only got to meet Robbie but they got to see him wearing palm leaves too
'Belter': Marcus gave it his all as he sang We Got Family by Paloma Faith
'This person is a very close friend of mine, this person lives in LA and this person's opinion I trust about 85%, they need no introduction, so I am not going to give them one, please welcome my guest everybody!'
Marcus was the first to sing choosing Paloma Faith's We Got Family which left Gary saying to Robbie in private: 'He’s such a belter; you know he really goes for it.
'It’s whether he will be able to do it week after week night after night. It’s whether he belts it out and doesn’t speak for two days,' he added.
Battling it out: Young hopefuls Luke and Craig sang to Gary and Robbie in Los Angeles hoping to make it to the live shows
Feeling the heat: John and Max were just two of the guys who sang to their mentor hoping to impress him
Firm friends: Kelly Rowland invited singer, Jennifer Hudson, to Miami to help her choose her finalists
Miami girls: Melanie and Misha wore contrasting colours to perform at Kelly's house in the U.S.
Nervous: Holly (left) appeared to be really concentrating as she performed her audition in front of the two superstar singers whereas Amelia Lili seemed more confident
Singing her heart out: Sophie sang as good as she could for her mentor and her friend
Talking things over: It was tough for Kelly and Jennifer to choose just three hopefuls to take to the live shows
Welcome: Tulisa greets her groups in Mykanos, Greece and introduces them to her guest Jessie J
Hitting the right note: Boyband Chasing Keys sang to Tulisa and Jessie J in the hope that they might go through to the live finals
Competition: second boyband The Risk had a fantastic view of Mykanos as they performed
Only young: the four girls known as Rhythmix were dressed rather funky as they performed in Greece
Very Grecian: Estrelle looked and sounded great for their performance abroad
Then there were three: The Lovettes gave it their all when performing to Tulisa and singer Jessie J
Just a duo: Boy v Girl were the smallest group in the auditions at Tulisa's home
Singing for Essex: Two Shoes wore matching gold maxi dresses to perform in front of the singers
Nearer to home N-DUBZ singer Tulisa Contostavlos had invited her groups to Mykonos in Greece and brought singer Jessie J along to help her make her big decisions.
'All I care about is having the winner in my category and I believe it’s there,' Tulisa said confidently.
First up to sing were boyband The Keys.
Jessie J took the opportunity to ask the guys if they had topped up their suncream but they answered: 'Yeah, it’s a bit late for that, we already look like beetroot!'
Tough decision: Tulisa and Jessie J converse in between performances whilst making important notes
Ruthless: guest Jessie J helped Tulisa choose her three groups for the live finals
Mature singers: Samantha and Kitty were up against one another to perform in front of Louis Walsh in Torrellea, Spain
Taking the plunge: Kitty decided to jump into a nearby pool during her performance
Which man will win? Jonjo (left) and Joseph proved to Louis why he had brought them to Spain by giving amazing performances
Doing Harrow proud: Middle -aged Johnny sang for a place in the live X Factor finals
X-Factor UK 2011 Bootcamp 2 (extra)