They say imitation is the sincerest form of flattery - but in the wonderful world of celebrity impersonators, not all so-called lookalikes are that convincing. Take this young man, above left, who has just won a major George Clooney doppelgänger contest. He may have a certain je ne sais quoi about him, but we won't be mistaking him for the former ER star anytime soon.
With that in mind, we've delved into the murky, and often hilarious, realm of celebrity doubles. Which ones would you be taken in by? Find out in our gallery, below.
Simply click on an image to launch the gallery.
Picture credit: Rex Features
Dubious celebrity lookalikes
Kilkenny resident David James Glendon beat off 782 competitors to be crowned the ultimate George Clooney in a recent lookalike competition.
Suave he may be - but we doubt there will be much confusion when David, 27, claims his prize and attends this year's Oscars in Los Angeles...
Dubious celebrity lookalikes
Where the real George will, of course, be present.
Spot the difference?
Dubious celebrity lookalikes
A close look at this Brangelina double won't fool anyone.
Dubious celebrity lookalikes
The real deal are likely to provoke a lot more cheers.
Dubious celebrity lookalikes
Paris Hilton copy Natalie Reid has been cashing in on her socialite looks for the past few years in LA.
Dubious celebrity lookalikes
But is she really a match for the actual Ms Hilton? We think not.
Dubious celebrity lookalikes
This Oprah Winfrey lookalike knows how to salute the crowds.
Dubious celebrity lookalikes
However, it's Oprah herself who radiates a real star quality.
Dubious celebrity lookalikes
Lorna Bliss - "the UK's number one Britney impersonator" - struts her stuff on Britain's Got Talent last year.
Dubious celebrity lookalikes
But Britney and Britney alone could move it like she did at the 2001 MTV Video Music Awards.
Dubious celebrity lookalikes
Professional Johnny Depp doppelgänger Danny Lopez is actually pretty convincing - if you squint a little...
Dubious celebrity lookalikes
Yet up close only, true flesh-and-blood Johnny can get pulses racing.
Dubious celebrity lookalikes
We'll not be taking any political tips from deputy PM Nick Clegg double, the improbably named Bentley Branning...
Dubious celebrity lookalikes
He's nothing like the real Nick Clegg up close.
Dubious celebrity lookalikes
This Ozzy Osbourne lookalike just about cuts it, but we're not at all duped by the Mrs O on his arm...
Dubious celebrity lookalikes
They'd have the real Sharon and Ozzy laughing in the aisles, we fear.
Dubious celebrity lookalikes
She's got the right sort of drink and hat, but this Sarah Jessica Parker wannabe is not especially persuasive.
Dubious celebrity lookalikes
The real Sarah Jessica Parker could out-hat her counterpart in an instant.
Dubious celebrity lookalikes
Simply the best?
The jury's out on this Tina Turner lookalike.
Dubious celebrity lookalikes
We doubt the real Tina Turner would be that impressed.