Kim Kardashian gets more work done: Reality star goes undercover in a curly wig and wonky teeth for new show... and not even Kourtney recognises her

She recently appeared to have undergone something of a make-under when she stepped out with pale skin, newly cut mid-length hair and pared down make-up.

But Kim Kardashian has gone for a complete transformation, this time making her usually-straight tresses all frizzy and swapping her perfect teeth for a wonky set, as well as adding a pair of glasses.

Who's that? Kim Kardashian underwent a complete transformation for new TV show Celebrities Undercover

Complete transformation: The reality TV star swapped her usually-straight tresses for frizzy hair and her perfect teeth for a wonky set, as well as adding a pair of glasses

Prosthetics: Kim underwent a complete transformation for her new look

Makeover: Kim had several make-up artists working on her while she underwent her huge transformation

However, the reality TV star's makeover is all for Wendy Williams' new TV show Celebrities Undercover, which sees stars using prosthetic make-up to cover up their true identity to test their fans loyalty.

Kim transformed into her alter-ego Cynthia, who had a slight resemblance to TV character Ugly Betty, for the programme and then set about trying to trick three of her female fans.

If Ugly Betty had a mother: Kim pretended to be one of her own fans for the skit on Celebrity Makeovers

Well done: Kim managed to successfully trick her fans and prove they were loyal

Cynthia acted as a fan of Kim in a fake group interview for a job as the Keeping Up With The Kardashians star's latest assistant.

The supporters were given several tasks to test their loyalty, but unbeknown to them they were being filmed on undercover cameras.

Dressed down: Kim swamped her figure in an unfashionable shapeless blouse and wore leggings

Undercover: The brunette beauty's fans had no idea it was her underneath the wig and glasses

Haven't got a clue: Kim's fans were overwhelmed by the occasion and didn't even realise they were sitting right next to their idol

No idea: Kim transformed into her alter-ego Cynthia, who had a slight resemblance to TV character Ugly Betty, for the programme and then set about trying to trick three of her female fans

On the show the three supporters were told by Kim's fake assistant that she had spent the night with rapper Eminem.

Later on a gossip reporter, who was played by an actor, said he would give the three females $5,000 if they would confirm the fake story, but they all refused.

In another test of their loyalty, the trio were offered gifts meant for Kim, but they refused to take them.

It's me: Kim eventually had to whip off her wig and reveal herself

Shock: Kim's fans couldn't believe it was really her when she took off her disguise

You can't be serious: On the show the three supporters were told by Kim's fake assistant that she had spent the night with rapper Eminem

No way: The supporters were given several tasks to test their loyalty, but unbeknown to them they were being filmed on undercover cameras

Kim eventually had to come clean and reveal she was Cynthia when she moved from her office to her own house and her sister Kourtney Kardashian and her boyfriend Scott Disick showed up.

However, before the 33-year-old star could whip off her wig and false teeth, Kourtney started quizzing her as Cynthia and didn't even recognise it was her sibling.

Wendy, who is executive producer on the show, previously said: 'The celebrities featured in the series threw themselves into their undercover roles with passion and a ton of humour, giving viewers a new, highly entertaining spin on their public personas.'