In the capital, X Factor contestants including James Arthur and Ella Henderson took a midnight stroll to Buckingham Palace, while Pippa Middleton enjoyed an evening at Roka restaurant and Evanescence performed live at Wembley Arena.
The Kardashian sisters were in town to promote their clothing line at Dorothy Perkins. Kim, Khloe and Kourtney joined Kim's boyfriend Kanye West for dinner at the Hakkasan restaurant. The girls today descended on Westfield shopping centre to launch their fashion line.
In the US, Keira Knightley left the ABC studios after appearing on Good Morning America, with Downton Abbey actor Dan Stevens also appearing to talk about his Broadway debut. Elsewhere, Jennifer Love Hewitt was seen filming a new episode for her show The Client List.
In Manchester, Carolynne Poole joined Misha B to switch on the Christmas lights, and in Germany Gwen Stefani was just one of the stars seen out and about in preparation for the MTV European Music Awards.
To see all of these pictures, scroll through our gallery below.