By Stephanie Hirschmiller

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Pop sensation Rihanna is known for her extreme style from the top of her dollar embellished baseball cap to the tips of her uber-manicured talons.

But how does she know if she's gone just a smidgeon too far? 

Her manicurist, LA based nail artist, Kimmie Kyees, revealed all this week in an interview with People.

She's got it nailed: If she can still use her trusty iPhone, Rihanna's manicure is the perfect length

'She loves her long nails,' Kyees explained, continuing, 'She does the iPhone test - if she can still type then [they're] OK.' 

Kyees first worked with Rihanna in 2007 on the Barbados born star's Umbrella video.

She also divulged that while some stars just sit back and let her get on with it, Rihanna is 'involved with everything about her look and style — she’s a trendsetter'.

Hard to believe but Rihanna can still use the iPhone she's holding...

Hard to believe but Rihanna can still use the iPhone she's holding...

The style the Where Have You Been star currently favours is a 'narrow square shape acrylic' and, according to Kyees, Rihanna actually came up with this one herself.

Rihanna is designing a new clothing range for Armani and also recently revealed that she has ambitions to create her own label in the not too distant future. 

So nails are as good a place as any to start!

Kyees has also worked with Jennifer Lopez and the Kardashians but her most recent job involved Katy Perry's ying yang mani.

This is the one the Part Of Me star sported at Capital FM's Summertime Ball last week, as she filmed with Cheryl Cole for the Graham Norton Show and even falling out of Soho's Cirque de Soir night club. 

According to Kyees, 'She said they’re her favourite ones that I’ve ever done for her!'

And they've certainly stayed the distance! Kyees used gel: 'super easy to get up and go because there’s no dry time and you have versatility'. 

'You can put a pair of press-ons over the gels, and when you take them off you still have a perfect manicure.' So that's how Katy's manicure lasted so long. Shame Kyees couldn't work similar magic on her marriage to Russell Brand...

Ying Yang: Katy Perry (right) loves her Kimmie Kyees manicure so much she even tweeted this picture of it (left)

She may be a little unsteady on her feet but at least the mani's going strong

She may be a little unsteady on her feet but at least the mani's going strong

Here's what other readers have said. Why not add your thoughts, or debate this issue live on our message boards.

The comments below have not been moderated.

Now there's a girl who never has to do any washing up...

UGLY NAILS

Get your facts dm, that's not even an iPhone! Probably too busy hacking into them than looking at them aren't you!

That wasn't even an iPhone she was holding.

long like claws....

How did we ever survive without half a dozen stories about Rihanna every single day DM?

Far too long. Also..is this really news?!

At least the claws on my cat look real and serve a purpose. Hers do neither.

She must have someone to care for her as those nails make you disabled sure wouldn't like to try and wipe my bum with them!!!

Utterly gross. Look like claws.

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