Kim Kardashian's best friend sent a text message that might have saved her life.

Kim Kardashian’s high school best friend, celebrity stylist Simone Harouche, reportedly hid in the downstairs bathroom of the luxury Parisian apartment while Kim was robbed of $14 million in jewels.

Reports differ as to how Harouche was alerted to the fact her friend was in danger – some say Kim screamed for help, while others report she simply “heard noises” before hiding in the bathroom.

As the five armed robbers bound the reality star's wrists and locking her in a bathroom, Simone texted Kim's longtime bodyguard Pascal Duvier and her sister Kourtney Kardashian.

Outside Kim Kardashian West's Paris apartment. Source: Getty. 

"She couldn't dial 911 from her phone," a source told E! News.

A look back through Kim's jewellery collection (post continues after gallery):

Mr Duvier - who has become the subject of scrutiny after he left Kim alone for the night - was escorting Kourtney and Kendall Jenner on a night out to L'Arc nightclub two miles away.

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A photo posted by Kim Kardashian West (@kimkardashian) on Sep 29, 2016 at 12:40pm PDT

Once the men had left the apartment, Kim ran to Simone with "duct tape on her legs" and told Simone to "jump off the balcony to get free".

Kim's lavish 15-carat diamond engagement ring, two smartphones and €1000 in cash were stolen during the traumatic event.

Listen: The MMOL team discusses Kim Kardashian's robbery, the conspiracy theories and why the reaction online was so disappointing. Post continues below.

Like Kim, Simone has since arrived back at her Los Angeles home where she lives with her husband and daughter.

Reports have also emerged that two of the five criminals were following Kardashian West closely for days prior to the heist.

This guy is always in my shot!

A photo posted by Kim Kardashian West (@kimkardashian) on Oct 2, 2016 at 10:24am PDT

"Kim Kardashian was tailed for at least three days before the robbery," a source purported to be close to French police told The Daily Mail.

"We know there was one man who pretended to be a photographer who followed the American celebrity on a motorbike to find out her whereabouts. Another man pretended to be a plain-clothed detective to try to get a seat next to her at the exclusive Ferdi restaurant on Thursday night."