A real English rose! The Duchess of Cambridge is pretty in pink in a £428 Kate Spade floral dress as she joins William and Harry to mark World Mental Health Day in London

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The Duchess of Cambridge glowed in pretty pink floral dress to mark World Mental Health Day as she stepped out in London with Princes William and Harry.

Kate, 34, on her first public engagement since returning from an official tour to Canada a week ago, sported the £428 summery knee-length Kate Spade dress - without a coat, despite the bright but biting autumn sunshine - as the royal trio attended an event at London's County Hall to an event to publicise the issue of good mental health.

Later William, Kate and Harry will take a ride on the London Eye with young people who have battled psychological problems and been brave enough to share their experiences with others.

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The Duke and Duchess of Cambridge and Prince Harry arriving to celebrate World Mental Health Day with a special Heads Together event at County Hall and The London Eye

Fun-loving Prince Harry grinned as he arrived at County Hall with his sister-in-law Kate this morning

The Duchess has been wearing more high end designers recently, including today's creation from New York-based Kate Spade

The Duchess glances up at The London Eye, which will later be lit up in purple to mark World Mental Health Day

Kate receives a posy from Joanne Sibley, a student from Livability’s Victoria Education Centre in Poole, Dorset, who was also dressed in pink for the special occasion

The Duchess's dress by Kate Spade features a pussy bow feature and light pleating  

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With the Royal tour of Canada at an end we weren't sure when we'd get to do a bit of fashion spotting on the Duchess of Cambridge again, but lo and behold she's out and about today and it's like she's never been away.

In Canada Kate tried some new labels like See by Chloé and Preen by Thornton Bregazzi and it seems like she's sticking to the trend by wearing a dress by Kate Spade. This stateside label is a favorite of her sister Pippa Middleton and Kim Murray who both have a similar aesthetic to the Duchess, so we're just surprised she hasn't worn it before.

In a pretty shade of pink with a dusky rose print it's ultra feminine as you'd expect, a feel that is only accentuated by the retro pussy bow neck tie and the pleated skirt. The good news for all you Kate obsessives out there is it's available to buy so click (right) to snap it up at Nordstrom before the Kate effect takes hold.

Then wear with a pair of classic blush courts to complete the look. Or you can, of course, shop our edit of similar blooming lovely frocks below.

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First, however, they are attending a reception where they will meet young people whose lives were changed thanks to crucial support from a relative, colleague or friend.

Outside the Eye the royals were greeted by Rosi Prescott, Deputy Lord Lieutenant for Lambeth, and David Sharpe, Divisional Director of London Midway attractions, which runs the London Eye.

Kate was given a posy from Joanne Sibly, 17, who has been chosen to represent Merlin's Magic Wand, the charity which grants wishes to children who are sick, bereaved or terminally ill. They were also greeted by Ian Cheshire, Chairman of Heads Together and Elisha London, Head's Together's Campaign Director.

William, Kate and Harry will spend the day talking to those who have battled with psychological problems - and hear about the help they have received, in keeping with the theme of this year's awareness day, which is 'mental health first aid'. 

Prince Harry leans over to chat to a Joanne Sibley who was chosen to greet the royals as they arrived  at London's County Hall

The Duchess of Cambridge looked surprisingly summery today in a pink rose print dress for a day of engagements in London

The close trio are at County Hall to promote their Heads Together initiative which aims to change the national conversation on mental health 

Kate decided to forgo a coat, despite the bright but biting autumn temperatures 

Outside the Eye the royals were greeted by Rosi Prescott, Deputy Lord Lieutenant for Lambeth

At a reception at County Hall, the royals will meet those whose lives were changed thanks to crucial support from a relative, colleague or friend.

Guests will be able to take selfies in a special photo booth in County Hall with a message thanking someone for being there for them, as part of a #Thereforme social media drive.

Later on, The Cambridges and Harry will take to the London Eye with some of the people who have shared their experiences with them. 

Kensington Palace said the Duke, Duchess and Harry were interested in learning about the kind of support that is most effective as they explore future projects through the Heads Together initiative.

Kate glances upwards as she strolls along with Prince Harry. Later the trio will board the London Eye with people who have shared their experiences of mental health issues 

Kate looks delighted as she chats to Joanne Sibley after she was presented with a bouquet 

Kate receives a curtsy as she arrives at County Hall for an engagement to mark World Mental Health Day 

William opted for a smart casual look in navy trousers and a blazer with a white open neck shirt and brown suede loafers

The Duchess of Cambridge looked surprisingly summery today in a pink rose print dress by Temperley London for a day of engagements in London

The Duchess teamed the summery frock with a pair of her favourite nude court shoes 

The royal trio are accompanied to County Hall to meet with people who have suffered mental health issues and hear how they were helped by friends and family 

William, Kate and Harry are spearheading Heads Together, a campaign that aims to change the national conversation on mental wellbeing and is a partnership between charities that provide frontline mental health support

Heads Together, which is being spearheaded by the royal trio, aims to change the national conversation on mental wellbeing and is a partnership between charities that provide frontline mental health support.

These include Contact, Mind and Place2Be, the children's charity of which Kate is royal patron.  

This year’s theme for World Mental Health Day focuses on the importance of psychological and mental health first aid for all.

Later in the day, the Eye will turn purple in support of World Mental Health Day.

The global Light Up Purple drive was set up in memory of Canadian teenager Amanda Todd, who killed herself in 2012.

The 15-year-old brought the problem of cyber bullying to mainstream attention after she posted a video on YouTube in which she told her story with handwritten signs.