Princess Charlotte and Prince George watched their parents go head-to-head in the King’s Cup regatta off the Isle of Wight on Thursday.

​Grandparents Michael and Carole Middleton were on hand to help keep an eye on the children as they watched the race from a boat.

During the event the young princess made the crowd erupt with laughter when she stuck her tongue out as her mother the Duchess of Cambridge encouraged her to wave.

Charlotte wore a blue Ralph Lauren Seersucker Fit-and-Flare Dress (US$65). 

The sleeveless frock features a blue seersucker stripe with contrasting club collar and a fit-and-flare silhouette with box pleated skirt.

The style is also available in a pink colourway at Ralph Lauren and My Theresa.

Princess Charlotte joined her brothers and mum for a day out at the at the Billingbear Polo Club to cheer on their dad who was competing in the King Power Royal Charity Polo Day.

Princess Charlotte joined her family today on the balcony at Buckingham Palace for the Queen’s official birthday celebration.

This was her fourth appearance on the iconic frontage of the London landmark, following her debut in 2016.

The extended royal family had gathered to watch the traditional Trooping the Color military fly-past.

Princess Charlotte wore a blue print dress in a signature smock style, similar to last year’s frock. The ditsy floral print dress has a Peter Pan collar with blue piping, puffed sleeves, and a smocked bodice.  The brand of the dress is unknown.

Charlotte wore her hair parted down the centre front with two braids tied in the back with a blue ribbon.

Princess Charlotte and her brother's Prince George and Prince Louis had a fun day out at the Chelsea Flower Show as they joined their parents to explore the 'Back to Nature' garden co-designed by their mother, the Duchess of Cambridge.

​The garden is a woodland setting for families and communities to come together and connect with nature. Over the past months, Princess Charlotte and her brothers have helped their mum gather moss, leaves and twigs to help decorate the natural exhibition. 

In celebration of her fourth birthday tomorrow, Kensington Palace released three photos of Princess Charlotte taken last month by her mother, the Duchess of Cambridge, at Kensington Palace and at their home in Norfolk.

In two of the photos above, she is wearing the Amaia Kids 'Yarrow' Tartan Plaid Skirt, first seen at last month's Burnham Market international horse trials. It's teamed with a navy rollneck top and grey cardigan (unidentified).

A couple of my readers have suggested the top could be the 'Alex' Rollneck by the Chelsea Clothing Company from Trotters (£14), or perhaps the John Lewis Girls' Roll Neck School Top (£14).

In the photo below, the young princess if wearing the Lily Rose 'Betsy' Dress from Trotters (ID by @KatesKidsWore), and her navy Hampton 'Plum' Canvas Shoes.

The Daily Mail has exclusive photos of the Cambridges and the Tindalls enjoying a day out at Burnham Market international horse trials in Norfolk.

The Cambridge clan gathered with extended Royal family members today for the Queen's (Gan Gan) annual pre-Christmas luncheon at Buckingham Palace. ​

The lunch was a private family affair but photographers managed to get some snaps of the guests as they entered the gates of the Palace. Princess Charlotte was spotted en route to the Palace in the back seat of her parents' Range Rover alongside Prince George.

Unfortunately there are no photos showing Charlotte's outfit so it's not possible to make comment about what she wore.

Kensington Palace released a new family portrait of the Cambridge clan this morning which will serve as their official 2018 Christmas card. The photograph, taken by Matt Porteous, shows Prince William, Duchess Catherine, Prince George, Princess Charlotte, and Prince Louis casually posing in the gardens of Anmer Hall, and features on the Cambridge family Christmas card this year.

Two family photographs have been released by Clarence House ahead of Prince Charles' 70th birthday tomorrow.

The photos of the Prince of Wales with his family were taken by Chris Jackson in September on the grounds of Clarence House.

Princess Charlotte and Prince George served as bridesmaid and pageboy today at the royal wedding of Princess Eugenie and Jack Brooksbank.   

The young bridesmaids were outfitted in bespoke commissions from Amaia Kids - a London based children's wear boutique.

The sashes match a piece of art titled "Here" by American artist, Mark Bradford.

The girls wore cream tights, with shoes by Papouelli - the the Sienna style in white leather, a classic Mary Jane style with a thin strap and goldtone buckle.

The bridesmaids carried posies with Lily of the Valley and roses, the same flowers found in Princess Eugenie's bouquet.