The surprise guest of the night was Twilight star Robert Pattinson who turned up around midnight wearing a scruffy jacket and jeans and a pair of fairly shiteous Nike Air trainers. It was a black tie dress code Robbie! Source.
You mean like this?

At the Soho House Grey Goose after-party at the Grosvenor House Hotel.: "First, Emma Watson did a round of one room with her ex-Harry Potter co-star Robert Pattinson. But while Rob seemed keen to whisk Emma off into a private bit of Harvey Weinstein's party, it seemed Emma was in too high demand." Source.
Gozde: I would have loved to see "Rob keen to whisk Emma off into a private bit". LMAO. These gossip writers crack me up! :)))