The British royals know their hats. But when it comes to crazy fascinators, there's no duchess nor princess who can match Lady Gaga.

Which is why we were stunned to see the typically wacky Lady Gaga pull a sartorial switcheroo with Camilla, the Duchess of Cornwall. The former stepped out in Hong Kong today looking shockingly conservative, wearing nothing but a black drop-waist dress (with 3/4-length sleeves!), black tights, gold sunnies and relatively tame Mary Jane platforms.

The British royal, on the other hand, attended a "freedom parade" in Thame today wearing a pop star-worthy fascinator. On the right side, the hat was a simple, off-kilter beret. On the left side, out sprang a giant blue rose encircled by Saturn-like rings.

What could have prompted Lady Gaga to dress down, particularly after her spectacular...ly strange wig dress just this week? And what got into Camilla that she decided to strap on a Royal Wedding fascinator -- the recent anniversary, perhaps?

Check 'em out.

PHOTOS:

camilla duchess of cornwall hat

See Camilla's style evolution!

Loading Slideshow...
  • January 1980

    (Getty photo)

  • June 2000

    (Getty photo)

  • June 2001

    (Getty photo)

  • April 2002

    (AFP photo)

  • July 2002

    (Getty photo)

  • July 2003

    (Getty photo)

  • June 2004

    (AFP photo)

  • April 2005

    (Getty photo)

  • April 2005

    (Getty photo)

  • April 2005

    (Getty photo)

  • April 2005

    (Getty photo)

  • November 2005

    (Getty photo)

  • March 2006

    (Getty photo)

  • May 2006

    (Getty photo)

  • June 2007

    (Getty photo)

  • June 2008

    (Getty photo)

  • December 2008

    (Getty photo)

  • March 2009

    (Getty photo)

  • April 2009

    (Getty photo)

  • June 2009

    (Getty photo)

  • November 2009

    (Getty photo)

  • March 2010

    (Getty photo)

  • December 2010

    (Getty photo)

  • January 2011

    (Getty photo)

  • March 2011

    (Getty photo)

  • April 2011

    (Getty photo)

  • May 2011

    (Getty photo)

  • November 2011

    (Getty photo)

  • November 2011

    (Getty photo)

  • December 2011

    (Getty photo)

  • January 2012

    (Getty photo)

  • February 2012

    (Getty photo)

  • March 2012

    (Getty photo)

  • March 2012

    (Getty photo)

  • March 2012

    (Getty photo)

  • March 2012

    (Getty photo)

  • March 2012

    (Getty photo)

  • March 2012

    (Getty photo)

  • March 2012

    (Getty photo)

  • March 2012

    (Getty photo)

  • March 2012

    (Getty photo)

  • April 2012

    (Getty photo)

Want more? Be sure to check out HuffPost Style on Twitter, Facebook, Tumblr and Pinterest.