Kate Middleton vs. Lady Gaga in hat battle

All photos: Splash/ All Over Press
All photos: Splash/ All Over Press
All photos: Splash/ All Over Press
All photos: Splash/ All Over Press
All photos: Splash/ All Over Press
All photos: Splash/ All Over Press
All photos: Splash/ All Over Press
All photos: Splash/ All Over Press
All photos: Splash/ All Over Press
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