04/21/2015 10:20 EDT | Updated 04/21/2015 10:59 EDT

Queen Elizabeth II Turns 89: A Look Back At Her Best Hats

Kate Middleton isn't the only royal whose style we follow religiously. Her grandmother-in-law, Queen Elizabeth II, is quite the fashion icon herself.

We love the monarch's monochromatic ensembles, her sparkling brooches, and her oh-so-enviable jewels, but our favourite part about the Queen's style is her vast collection of hats (and tiaras!)

So, in honour of Queen Elizabeth II's 89th birthday (April 21), we're taking a look back at her best chapeaux.

Click through the gallery below to have a look at the extensive collection, and let us know in the comments below which is your fave!

Queen Elizabeth's Best Hats

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