Newly promoted senior private executive assistant to William and Kate shows off her £5,900 Cartier watch on social media – the same model the Princess was pictured wearing

Recently promoted by the Prince and Princess of Wales, Natasha Archer is clearly in sync with Catherine.

The PA and stylist, who was handed the new title of ‘senior private executive assistant’ to William and Catherine, has been showing off her Cartier watch on social media.

It appears to be a £5,900 Ballon Bleu just like the princess has been pictured wearing in the past.

Catherine’s sister, Pippa Matthews, owns an even more expensive timepiece from the same Cartier range.

Hers is a dazzling diamond and pink gold watch worth more than £15,000.

The watch belonging to Natasha appears to be a £5,900 Ballon Bleu just like the princess has been pictured wearing in the past

Kate was first seen wearing her watch, a present from Prince William, on a visit to one of her charities, The Art Room, in 2014

The princess was first seen wearing hers, a present from Prince William, on a visit to one of her charities, The Art Room, in 2014. It is believed to be a 36mm watch with a steel bracelet.

‘Girl Friday’ Natasha’s promotion has been interpreted in royal circles as a reward for her loyalty.

The 36-year-old has been pictured carrying Catherine’s bags on and off planes for royal tours.

The move follows reports that she personally collected the princess from the London Clinic after her abdominal operation earlier this year.

After that, she was brought into the innermost circle of select friends and family members who have been supporting Catherine through her private cancer battle.

Sources say Ms Archer – who has two children with her husband, the royal photographer Chris Jackson – has been dedicated to her employer.

She has been inseparable from Catherine in recent months, often assisting her as she travels to and from hospital appointments.

A source told the Mail on Sunday: ‘Natasha deserves this boost – she’s unfailingly discreet and loyal to Kate.

‘The salary boost will be welcome too. This appointment means we can expect to see Natasha by Kate’s side for years to come.

‘It seems to be Kate’s way of thanking her for her loyalty.’

Before joining William and Catherine, she worked in the private office of the Duke and Duchess of Gloucester, whom she joined in 2007.

She attended the £48,000-a-year Uppingham School in Rutland, whose alumni also include Stephen Fry.

Hollywood star Hugh Jackman once worked there as a teaching assistant.