WhoopsWhoopsIt's always a bit precarious wearing a floor-length gown.

Not only are there puddles and pavement phlegm to deal with, but one's own feet can cause mayhem.

And so Sienna Miller found out during a recent trip to the Metropolitan Opera in New York.

She arrived looking uber glam in a stunning long, grey frock - only for snaps to appear from the end of the evening showing a great, big, gaping rip in said dress.

Yikes.

Whether Sienna stood on the gown with one foot and walked on with the other herself, or whether someone else (including Jude) got too close and trod on the material, is anyone's guess.

Either way, the poor love.

It wasn't like it was a tiny hole she could have safety pinned up - she needed some serious gaffer tape instead.

See more in the gallery above.