Princess Eugenie joked about her awkward situation at the Duke of Westminster's wedding.
The princess's husband, Jack Brooksbank, did not join Eugenie at Hugh Grosvenor's nuptials to Olivia Henson.
A source claimed that Princess Eugenie, 34, admitted to "fifth-wheeling" four of her close friends on the big day.
They said: "The princess joked that she was her friends' 'fifth wheel' whilst enjoying a drink at the bar the night before the wedding.
Princess Eugenie wore a gorgeous olive green dress to the wedding
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"It was so funny to hear her using slang just like us.
"She was incredibly normal and chatty and was even drinking beer out of the bottle."
The source continued to tell Hello: "She also enjoyed a pint of Guinness - can you believe it?"
Prince Andrew's youngest daughter wore an olive green dress from the fashion brand Joseph for the high-society wedding.
Princess Eugenie was not joined by Jack Brooksbank for the occasion
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In addition, Eugenie carried her older sister Princess Beatrice's clutch bag from the brand Anya Hindmarch.
She also wore nude Aquazzura heels, which Meghan Markle wore for her engagement photographs with Prince Harry in 2017.
Princess Eugenie's cousin, Prince William, was one of the Duke of Westminster's ushers for the important day.
Grosvenor and Henson said "I do" inside Chester Cathedral, where hundreds of locals had gathered outside to celebrate the happy couple.
Princess Eugenie carried a clutch bag owned by her sister Beatrice
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Princess Eugenie wore shoes that are also owned by Meghan Markle
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The newlyweds and their friends and family headed to the duke's family estate, Eaton Hall, for a lavish wedding reception.
Fabrizio Gobbato, the owner of Krum Gelato, told Hello: "To give an homage to the couple, I personally asked if the details of the wedding reception could be disclosed. And we have been told that there is a lemon theme with the wedding cake.
"So, we are making a very special lemon sorbet made with special Italian lemons that will be served tomorrow."
The Duke and Duchess of Westminster's glitzy afterparty included a huge feast, a massive fireworks display and a live orchestra.
