The outing comes two months after the 23-year-old actress and Janney, 21, were first linked together, and from the look of things, the relationship is growing strong. After being seen furniture shopping Friday, Janney was spotted leaving Watson's house in his pajamas Saturday morning. Later that day the two were seen strolling down the streets of London.
Watson previously dated William Adamowicz, with whom she was last seen in November of 2013 after reportedly breaking up the previous summer, for two years.
It's still unclear if the Harry Potter star will bring her new leading man to the Oscars this upcoming Sunday where she is confirmed to present.
Watson will next be seen in the adventure drama flick Noah, in theaters on March 28.
Celebrity Breakups and divorces of 2014 [PHOTOS]