Happy birthday to a princess making her hattery debut on her twentieth birthday, and with a Tiara Alert, too!  This is Princess Mako, the daughter of Prince Fumihito and Princess Kiko of Japan (the Prince and Princess Akishino).  She's the eldest grandchild of the emperor and empress, and she's a college student studying in Tokyo.

Turning 20 is something of a marker of adulthood in the imperial family; Mako gave a press conference in which she talked about the devastating earthquake that struck her country earlier this year as well as her own plans for the future, including royal duties.  She also appeared in full court dress for the first time, debuting this diamond tiara.  Looks a lot like the Cambridge Lover's Knot Tiara, doesn't it?

PHOTO CREDITS: AP Photo/Shizuo Kambayashi

Happy birthday to the maddest of the Norwegian royal hatters, Princess Märtha Louise!  Here she's pictured attending the wedding of Prince Joachim and Princess Marie of Denmark a few years ago, wearing her standby sparkler, the King Olav's Gift Tiara.  But, oh, the hats!

The Crown Princess of Sweden's Wedding (2010)
The Prince of Asturias's Wedding (2004)
The Prince of Orange's Wedding (2002)
The Duke of Brabant's Wedding (1999)

Hope you have a truly angelic day, your highness!

PHOTO CREDITS: Life

Welcome to a new feature on the blog -- Hatty Birthdays, celebrating some of our favorite hatters on their big day.  Let me know what you think!

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Happy birthday to the big kahuna of Belgian hatters, Queen Paola!  Here she is wearing a rather sensible chapeau during this year's National Day celebrations, but she's definitely had a few seriously mad hattery moments of her own!

Prince Albert's Wedding (2011)
Belgian National Day (2010)
Church of Our Lady of Laeken (2010)
The Prince of Orange's Wedding (2002)

Hope you have a wonderful day, Your Maj!

PHOTO CREDITS: REUTERS/Jan Van De Vel