Allison Williams talks being compared to Kate Middleton and having a similar wedding gown

Allison Williams is speaking out about her similarities to a certain royal!

The 30-year-old Girls actress stopped by Andy Cohen's SiriusXM radio show, Radio Andy, earlier this week and dished about where the comparisons between her and Kate Middleton -- who celebrates her 37th birthday on Wednesday -- originated.

"I wrote a series of sketches for Funny or Die where I played Kate Middleton," Williams said of the four-episode series, Will & Kate: Before Happily Ever After, which debuted in 2011. "...I thought it would be funny to imagine the two of them out of the spotlight. What would be happening? I had them dancing on the bed to 'A Milli' by Lil Wayne."

The idea struck after Williams began getting told "once or twice a week" that she looked like the Duchess of Cambridge, something the actress definitely took as a compliment.

"I think it was just that I was white with brown hair and seemed slightly regal in some way, which is a huge compliment," she said. "She's my dream person. She's so elegant! I would faint in her presence."

Williams was again compared to the royal when fans noticed that her wedding gown resembled the Duchess' Alexander McQueen dress from her nuptials. For Middleton's April 2011 wedding to Prince William, she donned a long-sleeve gown with lace details and an elegant train.

When it came time for Williams to tie the knot to Ricky Van Veen in September 2015, she also opted for a long-sleeve dress. Williams insisted, though, that any similarities between the two gowns was merely a coincidence.

"I'm sure that's what an article said it's inspired by -- like, I can just picture that in print -- it's not the case," she said. "But it also had long sleeves."

Williams joked, "Then I guess it was just 100% just stolen from her. I stole Kate Middleton's wedding gown."

And here's Kate's:

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William and Kate's Royal Wedding
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William and Kate's Royal Wedding

Kate Middleton waves back to an excited crowd as she enters the church. This was the first moment the world caught a glimpse at the stunning Sarah Burton for Alexander McQueen gown.

Photo: Getty Images

Pippa Middleton arrives to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding.

When Pippa Middleton stepped out behind her sister Kate, the world took notice of her 'perfectly shaped backside'. Blogs, Facebook Pages and Twitter accounts were set up in its honor!

Photo: Getty Images

Kate looked just lovely as her father walked her down the aisle.

Photo: Getty Images

The Duchess's dress had an impressive, yet manageable, train, which Pippa tended to like a pro.

Photo: Getty Images

The happy couple could breathe a sigh of relief as they left Westminster Abbey -- it was now time for celebration.

Photo: Getty Images

Kate is simply gleaming following the ceremony while she's being taken with her new husband to the palace.

Photo: Getty Images

Um, hands down the best dressed of the day. How adorable are these kiddos?!

Photo: WireImage/Getty Images

Queen Elizabeth II following the Royal Wedding is perfect in light yellow!

Photo: Getty Images

Prince Harry is no stranger to these types of high profile events, but he seemed to be really enjoying himself.

Photo: Getty Images

Kate's parents were impeccably dressed, with the Mother of the Bride simply glowing in pale blue.

Photo: AFP/Getty Images

Princess Beatrice of York and Princess Eugenie of York exit Westminster Abbey after the Royal Wedding showing off their intricate and detailed hats (which garnered plenty of attention).

Photo: Getty Images

Victoria Beckham arrives to attend the Royal Wedding wearing a navy dress with a matching small pill box hat.

Photo: Getty Images

Tara Palmer-Tomkinson arrives to attend the Royal Wedding wearing an intricate royal blue hat which matched her blue dress.

Photo: Getty Images

The first royal kiss occurred on the balcony of the palace, but the real moment occurred right below when the little flower girl pressed her hands against her ears -- clearly, she was not amused.

Photo: Getty Images

Kate's second dress -- for the evening festivities -- was just as stunning. We loved the sparkling belt!

Photo: AFP/Getty Images

LONDON, UNITED KINGDOM - JANUARY 13: TRH Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge on the balcony at Buckingham Palace, following their wedding at Westminster Abbey on April 29, 2011 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, UNITED KINGDOM - JANUARY 13: TRH Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge on the balcony at Buckingham Palace, following their wedding at Westminster Abbey on April 29, 2011 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
Guests mingle in Westminster Abbey in London where Prince William and Kate Middleton will marry later today. (Photo by Anthony Devlin/PA Images via Getty Images)
Sir Elton John (left) and partner David Furnish are directed to their seats in Westminster Abbey in London where Prince William and Kate Middleton will marry later today. (Photo by Dominic Lipinski/PA Images via Getty Images)
The choir take their places in Westminster Abbey in London, where Prince William and Kate Middleton will marry later today. (Photo by Dominic Lipinski/PA Images via Getty Images)
Queen Elizabeth II arrives to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Ferdaus Shamim/WireImage)
Pippa Middleton arrives to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Ferdaus Shamim/WireImage)
Sister of the Bride and Maid of Honour Pippa Middleton depart the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Ferdaus Shamim/WireImage)
Catherine Middleton arrives to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding.
LONDON, ENGLAND - APRIL 29: Catherine Middleton arrives to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Pascal Le Segretain/Getty Images)
LONDON, ENGLAND - APRIL 29: Dignitaries arrive to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Jasper Juinen/Getty Images)
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While on Radio Andy, Williams also discussed the show for which she's most well known -- Girls. The HBO series, created by Lena Dunham, came to an end in 2017, but Williams is all for a reprising her character, Marnie Michaels.

"I hope for one. It'd be so fun. Likelihood? I genuinely don't know. I have no idea. It'd be so much fun," she said. "I think it would need to be, like, every decade. At one point Lena said, 'Every decade I want to check in on them.' I think that would be really, really fun."

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