The 23-year-old actress has been seeing Janney since last summer but their relationship is said to be still in the nascent stage, reported Contactmusic.
"It's early days but they're very much in to each other. Matt's a real hit with the girls but he may have finally met his match," a source said.
"She doesn't suffer fools gladly. But Matt's a lovely guy, charismatic and intelligent. They make a great couple," added the source.
Emma who is currently studying English at Brown University in Providence, Rhode Island, US had attended Oxford, London during 2012-2013 session where she met Janney.