Kate Middleton and Prince Harry are as thick as thieves during Queen"s Diamond Jubilee

Harry, prince of flirts! Kate and her brother-in-law are as thick as thieves as they make merry during Queen's Jubilee celebrations

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UPDATED:

07:23 GMT, 6 June 2012

He has described her as the sister he
never had. Once again yesterday Prince Harry and the Duchess of
Cambridge demonstrated the closeness of their friendship as they smiled
and giggled their way through the royal balcony appearance.

While Kate’s husband Prince William
stood formally, hands clasped, his cheeky brother whispered a series of
humorous asides to his sister-in-law.

Kate was equally gregarious, constantly leaning towards Harry to share with him her own observations.

Kate whispers in Harry's ear before the service

Kate whispers in Harry's ear before the service

The Duchess smiles at one of Harry's asides

The Duchess smiles at one of Harry's asides

More laughs on the palace balcony

More laughs on the palace balcony

If there is one thing that this
Jubilee weekend has proved apart from the nation's renewed passion for
the Monarchy it has been how warmly Kate has been welcomed into the
heart of the Royal Family.

The scenes of innocent fun were a
reminder of Harry’s teasing of Kate’s sister, Pippa, following last
year’s royal wedding which led to ill-founded rumours of a royal
romance.

Kate and Harry also chatted yesterday
as they rode in an open-topped carriage together and at the service of
thanksgiving at St Paul’s Cathedral where they put their heads together
and whispered as they waited for the Queen.

William adopts a formal pose on the balcony while his wife and his brother keep up the banter

William adopts a formal pose on the balcony after the service of thanksgiving at St Paul's Cathedral while his wife and his brother keep up the banter

Harry's repartee with Kate recalls his flirting with her sister Pippa

Harry's repartee with Kate recalls his flirting with her sister Pippa

Harry's repartee with Kate recalls his flirting with her sister Pippa at William and Kate's wedding last summer

Earlier this year the Daily Mail
revealed how Harry had moved near to William and Kate at Kensington
Palace, living in a one-bedroomed flat close to their home, Nottingham
Cottage.

The three young Royals are all utterly at ease in each other's company.

On
the balcony of Buckingham Palace yesterday afternoon, with Kate's role as a
senior royal cemented thanks to the depth of her involvement in the
Jubilee weekend celebrations, the affection the two share was more
evident than ever, as they cracked jokes and shared asides during the
fly past.

To their right, despite joining in the
revelry throughout the weekend, now a more serious William had one eye
on his duties. Standing next to his grandmother on this auspicious
occasion there can be no doubt the Duke of Cambridge's mind would have strayed to the
prospect that he would, one day, be standing on this very spot as King.

Still, William found the time to set
the gravitas aside from time to time, sidling over to his brother and
wife to join in the fun.

On
the way back to Buckingham Palace the three had shared a carriage and
looked to be having a whale of a time as they waved to the throngs
lining the streets.

That
morning, the three had sat in silent solidarity in St Paul's, looking
rather worse for wear after the previous night's revelry at the
Buckingham Palace Jubilee concert, where they had sung along and waved
Union flags from the royal box.

This
affection for Kate, and the ease in which all of the Royals have
accepted their newest member into their ranks, made her path from
newlywed to senior royal all the more smooth.

Gazing upwards: The family stare and gasp in delight as the Red Arrows zoom overhead

Modern face of the family: The royals have been careful to welcome Kate
into the heart of the family to avoid her suffering the isolation felt
by Diana

Modern face of the family: The next generation of royals beam as they admire the impressive show along with 1.5m people across London

Good friends: William and Kate spend lots of time socialising with Harry, and the three are firm friends

Lightening the mood: Prince William looks rather sombre as Harry shares a joke with his sister-in-law, the Duchess of Cambridge

Lifting the mood: Prince William chuckles along as his fun-loving brother Prince Harry shares a joke with his sister-in-law

Lost in thought: A serious-looking Prince William stands slightly apart from his cheerful wife and brother as he surveys the awe-inspiring scene

Lost
in thought: With his duties as future King perhaps weighing on his
mind, Prince William looks pensive as he surveys the awe-inspiring scene
from the balcony

Given
Diana, Princess of Wales' sense of isolation and difficulty in
adjusting to her new role as a Royal and the fallout which ensued, the
Queen and William were said to be adamant that Kate's trajectory would
be very different.

And it
has been thus. Not only has Kate received the Queen's royal seal of
approval, but she has enjoyed private suppers and opera visits with
Prince Charles, and been privy to personal advice doled out to her by a
supportive Camilla in meetings the two have had together.

At
public engagements, Kate is frequently seen laughing uproariously with
Camilla, or chatting earnestly with Charles. She has proved to be an
asset to the royals – and has been largely behind the world's renewed
interest in, and fondness for, the royal family.

She
has found her niche in the royal family with ease, thanks to her
natural warmth and the support offered to her by her new in-laws. And if
the images from this weekend's celebrations are anything to go by, it
looks as though they are as pleased to have her as she is to have them.

A royal source said: ‘Prince Harry adores his brother and says Catherine is the sister he never had.’

That's enough now: The Duke of Cambridge looks miffed as Harry continues to chat with his wife while he stands to the side

Deep in conversation: The Duke of Cambridge watches the fly past as the Duchess of Cambridge and Harry share a conversation

Kate and Harry

Prince Harry and the Duchess of Cambridge

Enjoying the moment: Fun-loving Prince Harry
kept up a running commentary as he entertained the Duchess of Cambridge
with jokes and observations


Roadtrip! The Duchess of Cambridge, Prince William and Prince Harry make the most of the carriage ride back to Buckingham Palace after the lunch at Westminster today

Road trip! The Duchess of Cambridge, Prince William and Prince Harry make the most of the carriage ride back to Buckingham Palace after the lunch at Westminster today

All smiles: The young royals beam and wave, clearly enjoying the ride

All smiles: The young royals beam and wave, clearly enjoying the ride

Composed: Kate looked the epitome of ladylike elegance at the service this morning

Composed: Kate, sat between a rather tired-looking William and Harry after last night's revelry, looked the epitome of ladylike elegance at this morning's service in her Alexander McQueen dress

Close: Kate leans in to chat to Harry, who looked to be suffering slightly from the effects of a later night during the service

Close: Kate leans in to chat to Harry, who looked to be suffering slightly from the effects of a later night during the service

A more formal setting for the prince and the Duke and Duchess of Cambridge after the Jubilee concert last night

The Stooges suffer! A more formal setting for the prince and the Duke and Duchess of Cambridge after the fun of the Jubilee concert last night

After a weekend of duties, the young Royals let loose at last night's Jubilee concert, where they waved flags and sang along to performances

It's party time! After a weekend of duties, the young royals let loose
at last night's Jubilee concert, where they waved flags and sang along
to performances by Paul McCartney, Elton John, Jessie J and Kylie
Minogue (l-r) Princess Beatrice, Duchess of Cambridge, Duke of
Cambridge, Prince Harry

Great show: Kate looked delighted to be part of the electric atmosphere

Great show: Kate and William looked delighted to be part of the electric atmosphere and William, who must have felt the weight of the future on his shoulders over this auspicious weekend, appeared to truly relax during the show

Sharing a joke: William and Harry were in high spirits at the concert

Sharing
a joke: Not for the first time, William and Harry were in high spirits at the concert, which
saw the senior Royals and younger members of the family come together in
a jubilant celebration