For the world premier of About Time in London this past weekend, the star Rachel McAdams pulled out all the stops and wore a brilliant, long, flowing white Roksanda Ilincic dress with a cool back stripe, holographic belt and a train. Somehow the designer managed to combine red carpet star power with cool, hip edge. I think this is a knockout and Rachel looks amazing.

The dress is youthful as well as being a stunner and she was top of many people's best dressed lists in this gown.

Then Rachel followed it up with something from the other end of the spectrum. She wore a cute, cut-out black cocktail dress from Saint Laurent for the Munich screening of the film. Obviously the aesthetic is very different there, and Rachel managed to read her audience perfectly.

I think that the neckline is amazing. And that ever-so-slight hint of side boob is incredible alluring — without giving anything away. This is a great start to the promo tour. Let's see what else she brings.