Kate Middleton and Prince William welcomed their daughter, the Princess of Cambridge, in May 2015 — see Princess Charlotte's sweetest photos

It tends to be the couture gowns and glittering tiaras that attract attention, but one underrated royal accessory carries real significance.

Queen Elena Castillo Flores of Avalor is the titular protagonist of the Disney Channel/Disney Jr. animated series Elena of Avalor. She is the oldest daughter of King Raul and Queen Lucia, the older sister of Princess Isabel, and the current ruler of Avalor, who, before she could become Queen and succeed her parents, learned to rule as the Crown Princess until she came of age. Princess Elena was born to the late King Raul and Queen Lucia of Avalor. She resides within the kingdom's castle…

Royalty doesn’t exactly feel regal when you remove the historic headgear

The 8-year-old joined her parents, the Prince and Princess of Wales, and her siblings for the big day.

They celebrated Lilibet's birthday with a backyard picnic at Frogmore Cottage.

The two are especially close.

It's hard to believe this year marks the 20th anniversary of Princess Diana's death — and we can't help but wonder what could have been if she hadn't died back in 1997. NBC's Dateline airs a special this Friday about the life and death of Diana, and we're taking a look back at her lifetime in photos in preparation. Originally published September 2009. Updated May 2017.