We've been getting increasingly concerned about Simon Cowell's face of late especially after his puffy-faced appearance on the 'X Factor USA' (nice of Sharon Osbourne to lend him her pillow cheeks, though).

But despite the cosmetic surgery rumours it's good to see he's keeping his chin up. Sorry, chins.

And it's not just us who think he might have had a little bit of nip/tuck - fellow 'Britain's Got Talent' judge David Walliams has also been winding him up about it during auditions for the talent show.

The 'Little Britain' star accused the music mogul of having cosmetic surgery during filming in London on Monday.

At one point he said: "How old are you? You've had a lot of work done."

But Simon - who has never confirmed if he's had any cosmetic procedures - didn't rise to the bait so the comic had another swipe at him after he questioned one of the act's 'likeability'.

"It doesn't matter whether people like me or not, I'm a good judge," Simon hit back.

Meanwhile, Simon's been busy winding up another of the 'BGT' judges.

Amanda Holden was said to be seriously peeved after he joked that the only reason she was famous was because she married TV star Les Dennis.

Amanda was talking of how she went from rags to riches when Simon quipped, 'You went from Les Dennis'.

Well if you're going to dish it out...

FOLLOW BAGGERS BITES ON TWITTER

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• Britains Got Talent Auditions - London

  Simon Cowell arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  David Walliams arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Ant (left) & Dec arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Amanda Holden arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Amanda Holden arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Amanda Holden arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Amanda Holden arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Amanda Holden arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Amanda Holden arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Alesha Dixon arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Amanda Holden arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Ant (left) & Dec arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Amanda Holden arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Amanda Holden arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Amanda Holden arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  The red carpet is swept outside the Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Amanda Holden arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Simon Cowell arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

• Britains Got Talent Auditions - London

  Simon Cowell arriving for Britain's Got Talent 2013 Judges Auditions Tour, at The London Palladium in central London.

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