Emma WatsonHarry Potter co-stars Daniel Radcliffe and Emma Watson have sparked romance rumours after they spent Valentine’s Day evening together.

The single pair decided to spend the evening together at the Imperial Arms pub in Fulham, West London, near Daniel’s home.

An onlooker told the Mirror: “They arrived quite late at the pub - about 10pm - and sat outside, using each other’s bodies for warmth.”

“Emma, who was wearing a black top and matching pashmina, kept looking over her shoulder nervously as if she didn’t wanted to be recognised. When people started to notice the couple and began pointing, she wrapped her scarf around her head so only her eyes were peeping out.”

“Daniel found her new look hysterical and started laughing. Throughout the night, in fact, he just kept giggling like a love-struck teen.”

“The pair seemed totally absorbed in one another’s company, though - they were chatting and joking easily until just before closing time.”

“They then left the pub, heads together and whispering, and headed in the direction of Daniel’s home nearby.”

The pair first became friends in 2000 when they started work on Harry Potter and the Philosopher’s Stone. The sixth film in the series Harry Potter and the Half-Blood Prince is set for release in November this year with the final film, Harry Potter and the Deathly Hallows expected to be released in 2010.