What a sweet lacy confection!
Why Katie was at a party for surfers, we really couldn't tell you. Maybe she secretly loves to shred, who knows!
Plus, she was standing by a pool, which is just like an ocean, except much, much smaller and lacking in marine animals, salt, and waves.
But anyway, all that matters is that Katie's outfit was a lovely, frothy piece that flattered her, and her lopsided smile was as adorable as ever.
[Image via Getty Images.]