Pregnant Pippa Middleton Arrives at Prince Harry and Meghan Markle's Royal Wedding

Getty Images

Kate Middleton's pregnant sister showed off her burgeoning baby bump.

Pregnant Pippa Middleton has arrived!

Kate Middleton's 34-year-old sister and her mini, burgeoning baby bump made their public debut at Prince Harry and Meghan Markle's royal wedding at Windsor Castle in England, on Saturday. Last month, word got out that Pippa and her husband, James Matthews, are expecting their first child together -- and this regal event marks the first time the expectant mother has been seen in public since the news broke.

Pippa was glowing in in a long-sleeved floral-printed mint green dress with a pleated pink and green skirt by Tom Ford, with a matching pale pink fascinator, as she arrived at Windsor Castle with her brother, James Middleton, and husband, James Matthews, both looking dapper in tailored suits. Pippa accessorized her chic look with nude Jimmy Choo pumps and a matching clutch.

Her parents, Carole and Michael, were also spotted arriving at the royal wedding.

Pippa Middleton arrives with husband, James Matthews, at Windsor Castle for the royal wedding. - Getty Images

Meghan and Harry attended Pippa and James' wedding reception last May. Coincidentally, May 20 -- one day after the royal wedding -- marks Pippa and James' first wedding anniversary.

Meanwhile, in 2011, at her sister and Prince William's wedding, Pippa inadvertently stole the show before the ceremony kicked off! The brunette beauty's sexy curves in a figure-hugging gown designed by Burton for Alexander McQueen became the center of countless headlines around the globe and remained a hot topic long after the wedding -- even inspiring a “Pippa butt lift” plastic surgery craze.

“It was completely unexpected," she told Today in 2014 about the "embarrassing" attention she received. "The plan was not for it to be a significant dress, really just to blend in with the train. I suppose it’s flattering. It’s actually still in my wardrobe at home. It’s the sort of thing that I’m sure I’ll bring out if someone wanted to see it or my children one day want to see it. It’s tucked away."

Be sure to keep up with all of ET's coverage of Meghan and Harry's wedding. For more on Pippa, watch below.