This bob is a brand new edgy style with sharp angles yet soft curls that are emphasized in the front.
The back of this hairdo is short and the front is long. A middle part and bang-less forehead are some of the characteristics. The defined large loose curls hang down and are showcased with this strapless dress that Kate is wearing at "Whiteout" Los Angeles Premiere. Here is a side view that shows how the back is cut.