Not far behindPrince GeorgeandPrincess Charlotteat any time is their very own Mary Poppins:Maria Teresa Turrion Borrallo.

The family’s trusted nanny lives at Kensington Palace to assistKate MiddletonandPrince Williamwith their three little ones — including their latest addition, 3-month-oldPrince Louis— and though she’s no pushover, Borrallo adores the little royals.

“Maria loves the children dearly,” a source tells PEOPLE. “She can be firm and strict, but she is very loving and soft with them too.”

Borrallo has been spotted out enjoying the summer with George and Charlotte, riding bikes (both without training wheels!) and enjoying the park outside their Kensington Palace home. The nanny alsostood behind a tongue-wagging Charlotte while the siblings watched a special flypastto the mark the 100th birthday celebrations of the Royal Air Force from a window in Buckingham Palace. Their parents watched the festivities with Queen Elizabeth,Prince Harry,Meghan Markleand other members of the family on thepalace’s famous balcony.

The moment was reminiscent of whenBorrallo adorably held Prince George to the window to watch the 2015 Trooping the Colour parade, helping him steal the show.

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Prince George And Princess Charlotte Spotted

Maria Borrallo withPrincess CharlotteandPrince George

Trooping The Colour

Borrallo has had a close-up seat to numerous royal events, often wearing the traditional uniform of Norland College, the university where she received her top-tier training in childcare. The “formal uniform” – which differs from the “practical uniform’ of navy trousers, blue sweater and blue collard shirt – is perfectlyMary Poppins-esque: a long brown woolen quote and a 1950s-style dress complete with gloves, brown lace-up shoes and a Norland hat.

According to thecollege’s web site, founder Emily Ward – who established the school in 1892 – introduced the uniform so that Norland Nurses (as the college graduates were originally known) would be recognized as professionals and “not mistaken for housemaids.”

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Borrallo sported the look while rounding up the children atPippa Middleton’s May 2017 wedding to James Matthews, where George and Charlotte were part of the bridal party.

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Wedding of James Matthews and Pippa Middleton, St Mark’s Church, Englefield, UK - 20 May 2017

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The Christening Of Princess Charlotte Of Cambridge

The native of Spain is also usually onhand when the little royals travel abroad, including their 2014 visit to New Zealand and Australia, where she made her first public appearance. She also joined Kate in the Caribbean when she and her family jetted off to the island of Mustique the following year.

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Prince William and Catherine Duchess of Cambridge visit Wellington, New Zealand - 09 Apr 2014

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Prince William and Catherine Duchess of Cambridge visit Sydney, Australia - 16 Apr 2014

source: people.com