was the gown's colour as it was an ice blue hue that's pretty close to white. There's no denying Syd looks gorgeous in the wedding guest dress, going seemingly sans accessories with her hair ...

The actress channeled the “Frozen” princess at the London premiere of her forthcoming film, “Echo Valley,” on Tuesday, sporting an ethereal icy blue Miu Miu dress with a long train.

But also because Sydney wore an ice blue dress that's pretty close to white ... At least based on this photo of everyone on their way to the wedding: ANYway, Sydney's appearance at this wedding ...