On Wednesday night, Miss Watson, 20, enjoyed an evening at the theatre with the long-haired teenager.
The pair watched highly-acclaimed production War Horse at the New London in Covent Garden, Central London.
Earlier in the day, Mr Craig, 19, spoke publicly for the first time of his admiration for Miss Watson.
He described her as 'wonderful' and told how much he was looking forward to their evening together.
On his Twitter internet site, he wrote: 'Heading to London this afternoon, going to the theatre tonight with a wonderful lady.'
Miss Watson has been spotted out and about with a series of young men in the past few years, including a rugby player and a financier.
But she has shown a tendency towards rockers - including Razorlight's wild frontman Johnny Borrell and her fellow student at Brown University, Rafael Cebrian, who is the drummer in a band.
