Harry and Hermoine together on V-Day

Actor Daniel Radcliffe has been spotted on a secret date with his Harry Potter co-star Emma Watson.

Radcliffe, 18, and Watson, who plays Hermione in the wizard film franchise, spent an evening huddled together in a London pub.

Watson, 17, was apparently so concerned not to be recognised that she made an impromptu disguise with her scarf.

The pair, who have always denied they are romantically linked arrived at 10pm at the Imperial Arms, Fulham, West London and spent the night giggling together in the garden.

An onlooker told the Daily 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 teenagers became friends seven years ago after meeting on the set of Harry Potter and the Philosophers Stone in 2001.

They pair have always insisted that although they enjoy each other's company, their relationship remains platonic.

Watson was pictured partying with the Razorlight frontman Johnny Borrell during London Fashion Week last week.

Last month Radcliffe split up with his girlfriend of a year, the 22-year-old actress Laura O'Toole.

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