Johnny Borrell and Emma Watson
02/13/2008 AT 11:00 AM EST
Those Harry Potter
kids sure are all grown up now: Emma Watson – aka goody-two-shoes Hermione Granger – spotted partying with Kirsten Dunst's ex
(and Razorlight frontman) Johnny Borrell?
"They were hanging out. Emma has had a boyfriend [rugby player Tom Duckworth] for years," a friend tells PEOPLE, pouring cold water on any romance talk.
Watson, 17, and Borrell, 27, first hung out Monday at the Burberry/Vanity Fair
portrait exhibition at London's National Portrait Gallery, where Borrell pointed out photographs of DH Lawrence (which he later told PEOPLE was his favorite) and Aldous Huxley to an adoring looking Watson.
"She was probably just a bit star struck," says the friend of the adoring looks. "She's usually chaperoned to these kinds of events by her father."
The pair – who were also joined by a female friend of Watson's – then headed on to a party across town for London fashion label PPQ. Borrell and Watson left the PPQ bash separately – the rocker with another girl.
Still, another source says that this Watson-Borrell encounter was a one-time thing. "She has never met him before," the source says. "She has not spoken to him since and will likely not speak to him again. "
The insider explains that the couple were photographed together for a simple reason: there were not enough cars to take Watson from one party to another, so she and Borrell opted to share one.