Kate Middleton attended the christening of Meghan Markle and Prince Harry's son Archie on Saturday.

The duchess stood out in an all-pink ensemble, pairing a Stella McCartney dress with pearl and diamond drop earrings that previously belonged to Princess Diana.

The fact that Middleton chose to wear the earrings for Archie's christening had a special meaning, as Diana wore the same pair for Prince Harry's christening in 1984.

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The Duchess of Cambridge was there to celebrate baby Archie's christening with Meghan Markle and Prince Harry over the weekend.

Kate Middleton posed with the couple in an official family photo after the ceremony, and some eagle-eyed fans have noticed a special tribute in her outfit.

The royal family posed for an official photo after Archie's christening. Chris Allerton/ Getty Images

The duchess opted for an all-pink outfit, pairing a pussy bow Stella McCartney dress with matching heels and a vintage headband. But it was her earrings that really stood out.

Middleton wore pearl and diamond drop earrings that were previously owned by the late Princess Diana. They had an extra special meaning on the day of Archie's christening, however, as Diana wore them for Prince Harry's christening in 1984.

Princess Diana and Prince Harry after his christening in 1984. PA Images/ Getty Images

Princess Diana's sisters, Lady Jane Fellowes, and Lady Sarah McCorquodale were included in the official christening photos.

It isn't the first time Middleton has paid tribute to her late mother-in-law.

Not only is the duchess often photographed echoing many of the royal's trademark looks, but she also included Diana in the garden she designed for the Chelsea Flower Show in May.

Read more: Here's how baby Archie's royal christening was different to the christenings of Prince William and Kate Middleton's children

In a photo of Middleton smiling on the garden's rope swing, there are forget-me-nots in the background — Diana's favorite flowers.

The flowers were planted in the gardens of Kensington Palace in 2017, a tribute to mark the 20th anniversary of Diana's death in 1997.

Since Middleton designed the garden herself, it's likely the duchess choose these flowers as a thoughtful nod to the late princess.