The Duchess Of Cambridge Is Having The Best Hair Day Ever

"I look so good tonight" - Beyonce, and probably Duchess Kate.

The Duchess of Cambridge's hair is a hotly monitored topic by royal enthusiasts the world over. Whether it's up, down, with bangs or in a pony, everyone has something to say about her locks.

So we couldn't help but notice something when the media phenomenon formerly known as Kate Middleton attended the 40th anniversary dinner for SportsAid, a charity that supports young athletes, in London Wednesday night. 

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EDDIE MULHOLLAND via Getty Images
Whoa.

Her hair, with its loose wave, perfect length and precise part, was looking especially fantastic. It was, dare we say, a royal slam dunk.  

As if the delightful 'do weren't enough, the duchess looked radiant in a stunning, form-fitting royal blue Roland Mouret gown with shoulder cut-outs that's still available in a few sizes and is on sale (!) on the designer's website.

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EDDIE MULHOLLAND via Getty Images
Babe in blue

A look back at some of Kate's recent hairstyles shows that while she always looks great, there's just something extra special about tonight's look. 

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Chris Jackson via Getty Images
A close runner-up.
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Mark Cuthbert via Getty Images
Really great, but not as great.

Perhaps she's finally done growing out the bangs of 2015?

Whatever it is, it's working. 

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Before You Go

Kate Middleton's Most Stylish Looks
(01 of29)
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Kate looked casual and cool in a Jonathan Saunders sweater while attending a children's rugby game in New Zealand on April 13, 2014. (credit:Getty Images)
(02 of29)
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Kate was a standout in a pleated Emilia Wickstead dress as shearrived in Dunedin, New Zealand on April 13, 2014. (credit:Getty Images)
(03 of29)
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The Duchess of Cambridge glowed in a Jenny Packham gown as she arrived at a London charity event on June, 9, 2011. (credit:ASSOCIATED PRESS)
(04 of29)
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Kate exuded elegance in a body-hugging Jenny Packham dress while attending a state reception in Wellington, New Zealand on April 10, 2014. (credit:Getty Images)
(05 of29)
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The Duchess wore a chic Zara blazer for a wine tasting event in New Zealand on April 13, 2014. (credit:Getty Images)
(06 of29)
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Kate stopped traffic in a lovely floral-print frock by L.K Bennett while arriving at the Royal Australian Airforce Base in Brisbane on April 19, 2014. (credit:Getty Images)
(07 of29)
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Kate looked casual, but chic in Hobbs while visiting Uluru/Ayers Rock in Australia in April 2014. (credit:ASSOCIATED PRESS)
(08 of29)
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The Duchess kept things classy with a teal suit by LK Bennett while visiting Leicester on the first date of Queen Elizabeth II's Diamond Jubilee in March 2012. (credit:Max Mumby/Indigo via Getty Images)
(09 of29)
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Kate attended the UK red carpet premiere of "Mandela: Long Walk to Freedom" in a Roland Mouret gown on December 5, 2013. (credit:Joel Ryan/Invision/AP)
(10 of29)
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Kate opted for a dramatic Diane von Furstenberg printed frock during a trip to the Blue Mountains in Australia on April 17, 2014. (credit:Getty Images)
(11 of29)
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The Duchess sported a tan Malene Birger frock during a welcome ceremony in Yellowknife, Canada on July 5, 2011. (credit:ASSOCIATED PRESS)
(12 of29)
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Kate dressed down in a ME+EM ensemble to sail with Team New Zealand on April 11, 2014. (credit:Getty Images)
(13 of29)
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The Duchess stepped out in an ice blue brocade Alexander McQueen skirt suit for the annual Trooping the Colour Ceremony on June 14, 2014. (credit:Getty)
(14 of29)
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The Duchess arrived at UK's Creative Industries reception in July 2012 wearing a classy gray Roksanda Ilincic dress. (credit:Mark Cuthbert via Getty Images)
(15 of29)
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Kate channeled Princess Diana in a red military-esque Catherine Walker coat while arriving in New Zealand on April 7, 2014. (credit:AP/SNPA)
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The Duchess of Cambridge stole the show in an Alice Temperley gown at the UK royal film premiere of "War Horse" in January 2012. (credit:Mark Cuthbert via Getty Images)
(17 of29)
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Kate turned heads in this Alexander McQueen coat on day four of the Royal Tour to New Zealand on April 10, 2014. (credit:Getty Images)
(18 of29)
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The Duchess stunned in a teal Jenny Packham gown while attending the London Olympic gala in May 2012. (credit:Mark Cuthbert via Getty Images)
(19 of29)
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The Duchess of Cambridge sported a Michael Kors coat dress while visiting the Australian War Memorial in Canberra, Australia on April 25, 2014. (credit:Getty Images)
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The Duchess donned a lovely white cocktail dress by American designer Leila Rose at a reception in Canberra, Australia on April 24, 2014. (credit:Getty Images)
(21 of29)
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The Duchess looked chic and polished as she arrived in Alberta, Canada in May 2011. (credit:Julian Parker via Getty Images)
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Kate appropriately donned a red Catherine Walker ensemble during a departure ceremony in Calgary, Alberta on July 8, 2011. (credit:Julian Parker via Getty Images)
(23 of29)
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Kate attended the Royal Variety Performance on November 13, 2014 wearing an elegant black lace gown by American designer Diane Von Furstenberg. (credit:ASSOCIATED PRESS)
(24 of29)
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Kate donned an Alexander McQueen coat for the Easter Sunday services at St. Andrews Cathedral in April 2014. (credit:Getty Images)
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Kate wore a long-sleeved nude and lace Alexander McQueen dress for a Buckingham Palace garden party in June 2014. (credit:Getty)
(26 of29)
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Kate kept things simple in a white Jaeger dress as she attended a breakfast reception in London in October 2014.
(27 of29)
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The Duchess sparkled in a silver Jenny Packham gown at the Tusk Foundation Gala in September 2013. (credit:Getty)
(28 of29)
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The Duchess of Cambridge stunned in another Jenny Packham dress on October 24, 2013. (credit:ASSOCIATED PRESS)
(29 of29)
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Kate proudly sported a red and white ensemble during a Canada Day celebration on Parliament Hill in Ottawa on July 1, 2011. (credit:ASSOCIATED PRESS)

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