When Pippa Middleton showed off her baby bump at the royal christening of Prince Louis on Monday, she did so in a vintage-style dress — in a style familiar from another recent royal event.

Pippa Middleton is the middle child of Carole and Michael Middleton and the younger sister of the Duchess of Cambridge. She was Kate's maid of honour on her wedding day to Prince William in 2011.

Find the latest news on Pippa Middleton's wedding dress, venue, guest list, with photos of the bride, the Duchess of Cambridge, Meghan Markle, Prince William, Prince Harry, bridesmaid Princess ...