22 of Kate Middleton's First Royal Milestones

Kate's first borrowed diamonds from the royal vaults were courtesy of the Cartier Halo tiara for her wedding day.

Unlike Garter Day, Trooping the Colour is a classic case of "no ring, no bring," so no girlfriends or boyfriends are allowed on the balcony — only husbands or wives. Kate made her debut two months after her wedding day in 2011 and jetted off to a friend's wedding straight after in the same outfit.

In October 2011, after six months of royal life, Kate performed her first solo engagement — standing in for Prince Charles at an In Kind Direct charity event.

A staple of the royal calendar is the service on Remembrance Sunday, and Kate's first went off without a hitch in November 2011.

It was clear that Kate was slotting right into the family when they appeared for their usual walk to church on Christmas Day 2011.

After months of research and advisory meetings, Kate's first charity patronages were announced in January 2012. Of the five, the first that she backed up with an engagement was on Feb. 10, attending a Lucian Freud exhibition at the National Portrait Gallery.

While William was away for military training in the Falklands, Kate performed a clutch of solo engagements, but the queen also invited both Kate and Camilla along for a Diamond Jubilee tour of Fortnum and Mason in March 2012.

Also while William was away in 2012, Kate accompanied her father-in-law, Prince Charles, to Dulwich Picture Gallery, where they got stuck into some arts and crafts.

Kate's first speech was also given while William was away and rounded off her inaugural set of engagements linked to her new patronages. On March 18, she appeared at The Treehouse — part of East Anglia Children's Hospices.

Rather than overload the new royal's calendar in the first year of marriage, it was over 12 months after their wedding before Kate made her first appearance at one of the queen's annual tea parties alongside Charles and Camilla in May 2012.

Kate's first official portrait was painted by Paul Emsley in 2013 and received mixed reactions, but Kate deemed it "amazing."

Another staple of the royal repertoire! While heavily pregnant with Prince George, Kate launched a cruise ship called The Royal Princess in June 2013.

Just over a month later, the duchess marked a more significant milestone when she posed outside the doors of St. Mary's Hospital with William and their hours-old baby boy, Prince George.

Although Kate has participated in many state events during her royal life so far, it wasn't until October 2015 that she attended her first state banquet at Buckingham Palace. It was held for the Chinese president, Xi Jinping.