Jill Biden attended King Charles' coronation with her granddaughter at her side. Here's why Joe Biden wasn't there.

• First Lady Dr. Jill Biden attended King Charles' coronation with her granddaughter, Finnegan.

• Biden wore a blue suit by Ralph Lauren, and Finnegan wore Markarian — both American designers.

• President Joe Biden didn't attend because no US president has ever attended a British coronation.

First Lady Dr. Jill Biden and her granddaughter Finnegan Biden represented the United States at King Charles III's coronation on Saturday.

Biden is the first US first lady to attend a British coronation. As Insider previously reported, no US president has ever attended one, instead sending delegations in their place. In keeping with historical precedent, President Joe Biden remained in Washington.

Both Biden and her granddaughter arrived at Westminster Abbey wearing outfits created by American designers, Vogue reported. The first lady wore a blue skirt suit designed by Ralph Lauren with matching gloves and a small bow fascinator. Finnegan chose a yellow cape dress by Markarian with a floral fascinator.

The day before the coronation, Biden and Finnegan also attended a reception at Buckingham Palace welcoming overseas guests, where they chatted with Kate Middleton.

After the coronation, Biden and Finnegan will attend an evening reception hosted by US Ambassador to the UK Jane Hartley, according to the White House.

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