The Britain's Got Talent auditions kicked off last Friday (18th January), reuniting Simon Cowell, Alesha Dixon, Amanda Holden and David Walliams alongside recent National Television Awards winners Ant McPartlin and Dec Donnelly.
After BGT judge and The Greatest Dancer host Alesha Dixon posted a photo of the group back together, fans were full of questions about Simon's 'new' and 'different' look.
But now, Simon has hit back at these 'cowardly' trolls, telling the Daily Star, "These are people who sit in dark rooms anonymously because they won't put their real names - which I think is cowardly - writing horrible things about you."
Simon made it very clear how he felt about the comments, going on to explain how he usually avoids reading them.
He went on to say, "I don't go on the message board and I don't Google myself. When you start doing that it becomes negative."
Celebrity transformations slider with cover pic
1 of 33Swipe through to see the most amazing celebrity transformations of all time...
2 of 33Little Mix, then
Perrie Edwards, Leigh-Anne Pinnock, Jesy Nelson and Jade Thirlwall looked very young in 2011 after winning The X Factor. To be fair, they were all teenagers at the time!
3 of 33Little Mix, now
Now the biggest girl band on the planet, the girls look fantastic!
4 of 33Calvin Harris, then
Scottish DJ Calvin Harris pictured here in 2009. Sorry Calvin, but we're not sure that look would be Acceptable In The 80s - OR now.
5 of 33Calvin Harris, now
The 'One Kiss' hit-maker transformed into an A-list hunk, and has dated the likes of Taylor Swift and Rita Ora. Twit twoo!
6 of 33Cheryl, then
Girls Aloud singer Cheryl was just a fresh-faced teenager when she auditioned for Popstars: The Rivals in 2002.
7 of 33Cheryl, now
She's now an on-trend and super-glamorous mum-of-one, even walking the red carpet at a London Fashion Week show.
8 of 33Justin Bieber, then
Little Justin Bieber was just a Baby when he burst onto the scene in 2009...
9 of 33Justin Bieber, now
These days, he's of course grown up - but he looks pretty much the same! Apart from the fact that he no longer has the signature Bieber hairstyle, of course.
10 of 33Rihanna, then
A young Rihanna in 2005...
11 of 33Rihanna, now
The still cheeky Fenty grin is still there, and Rihanna continues to defy the aging process.
12 of 33Matthew Lewis, then
Harry Potter star Matthew Lewis starred in the film series as Neville Longbottom from 2001 to the last film in 2011, here pictured in 2004 at the Harry Potter and the Prisoner of Azkaban premiere.
13 of 33Matthew Lewis, now
Matthew grew up into such a good-looking chap that the makeup department on the Potter films had to try and make him less attractive in the later films, even spawning the phrase 'Longbottomed'.
14 of 33Miley Cyrus, then
Miley Cyrus in her Hannah Montana days...
15 of 33Miley Cyrus, now
She may have gone through various transformations, but Miley is still recognisable.
16 of 33Gareth Gates, then
Pop Idol contestant Gareth Gates on the show back in 2001...
17 of 33Gareth Gates, now
Here in 2017, he showing off his muscular physique alongside his girlfriend Faye Brookes.
18 of 33Katy Perry, then
Katy Perry rocking long black hair in 2004...
19 of 33Katy Perry, now
And showing off her shorter, blonde pixie cut in 2017.
20 of 33Chris Pratt, then
Jurassic Park actor Chris Pratt back in 2008...
21 of 33Chris Pratt, now
Shed the pounds and now has a slimmer physique.
22 of 33Kylie Jenner, then
A fresh faced Kylie Jenner in 2008...
23 of 33Kylie Jenner, now
Now rocking a platinum blonde 'do at the age of 21 in November 2018.
24 of 33Zac Efron, then
Zac Efron in his High School Musical days back in 2007...
25 of 33Zac Efron
10 years later, he was looking incredibly dapper at the Australian premiere for The Greatest Showman in 2017 - even sporting a 'tache.
26 of 33Justin Timberlake, then
JT rocking his epic tight curls with frosted tips back in 2000...
27 of 33Justin Timberlake, now
He's so much more grown-up in September 2018 whilst performing in Las Vegas.
28 of 33Johnny Vegas, then
TV personality Johnny Vegas, real name Michael Pennington, is well known for his larger frame.
29 of 33Johnny Vegas, now
But in 2018, he revealed that he'd lost two stone.
30 of 33Jack Ryder, then
Jack Ryder, AKA Jamie Mitchell from EastEnders, was a noughties heartthrob if ever there was one.
31 of 33Jack Ryder, now
In 2018, Jack was announced to be joining Holby City - and look at him now!
32 of 33Jonathan Tapper, then
Gogglebox's Jonathan Tapper was 21st 3lbs at his heaviest whilst appearing on the show with his family - wife Nikki, daughter Amy and son Josh.
33 of 33Jonathan Tapper, now
But with the help of a diet plan, Jonathan was able to lose a whopping three stone in just 12 weeks, and six inches off his waist!
Meanwhile, Simon's BGT co-stars Ant and Dec made history on Tuesday night when they won their 18th National Television Award in the Best Presenter category.
Although there is no confirmed date yet, Britain's Got Talent is due to begin later in the year.
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