Surprising everyone, the 91-year-old monarch sat front row at the Richard Quinn show, in between British Fashion Council Chief Executive Caroline Rush and Anna Wintour.
She was all smiles both when she arrived and while she was sitting front row, making the rare appearance to present the first-ever Queen Elizabeth II Award for British Design.
For the occasion, the Queen wore a light blue skirt suit, black gloves, a black purse and pearls.
"Her Majesty The Queen is visiting London Fashion Week today to present the inaugural Queen Elizabeth II Award for British Design," the Royal Family Twitter account announced.
It went on to explain that every year an up-and-coming British designer will be honoured for showing "talent and originality, whilst demonstrating value to the community and/or sustainable policies."
This year, London-born designer Richard Quinn took home the prize.