As Harry Potter's sidekick Hermione Granger, she has little problem defending herself from the most wily of wizards.
But actress Emma Watson appeared to fall under the spell of hell-raising rock singer Johnny Borrell when she met him at a London fashion party.
The 17-year-old schoolgirl, in flesh-coloured halter neck dress and killer heels, was soon chatting with the star of the group Razorlight.
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Emma Watson has found a new friend...rocker Johnny Borrell of Razorlight fame. The pair were seen at the Vanity Fair event at the National Portrait Gallery
And they got on so well that they went on together to two further events.
Miss Watson's lawyer parents are unlikely to be thrilled at the unlikely pairing.
But the good news for them is that Emma and 27-year-old Borrell had parted company by the early hours of yesterday, by which time he was seen stumbling solo around the Dorchester Hotel.
The actress and the rock star began the evening at the Vanity Fair and Burberry Portraits party at the National Gallery.
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Borrell and Emma leave the Vanity Fair & Burberry party to attend a party given by designers PPQ at London's Dolce Nightclub
A fellow guest said: "Emma had gone over to speak to Pixie Geldof, who was chatting to Johnny at the time ? and Emma and Johnny immediately hit it off.
"It was clear they had loads to talk about ? even if they don't look like they have much in common."
The couple shared a cab to another fashion party, thrown by designers PPQ at the Dolce nightclub. From there, they are believed to have gone on to a private event at the Dorchester.
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Worse for wear Johnny heads home with with a mystery companion after a heavy night at the Dorchester Hotel..with Ms. Watson nowhere to be seen
But there was no sign of Miss Watson by 2.30am, by which time Borrell and another female friend were being shown the door for their over-exuberant behaviour.
Miss Watson, who is said to havemade a £10million fortune from the Potter film series, gained ten top-grade GCSEs and hopes to study philosophy at Cambridge.
But in recent months she has been keen to distance herself from her goody-two-shoes image.
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It's black and white: Johnny's ex Camilla Fayed opts for a monochrome waitress look, and model Erin O' Connor keeps it simple with stripes and a white coat
She has been signed up by the model agency Storm and, since becoming a face of Chanel, has stepped out in a series of increasingly glamorous outfits.
London-born Borrell was blamed for leading the U.S. actress Kirsten Dunst astray when they dated for several months last year.
On one of their nights out, the 24-year-old star looked immaculate on the red carpet at the premiere of Spider-Man 3 ? then was reduced to a giggling, stumbling wreck within hours after sinking numerous cocktails with Borrell.
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Frock stars: Lily Allen shines in a floor-length floral prom dress and St Trinian's actress Tamsin Egerton keeps her look undercover in a black belted dress coat
She was recently admitted to rehab, apparently still struggling to come to terms with the end of their relationship.
Judging by Borrell's perfomance last night, Watson could have her hands full with the hell-raising rock star.
Emma and Johnny turned out at the Vanity Fair party along with a host of stars, including Lily Allen, Pixie Geldof, Twiggy, Bryan Ferry and Will Young to celebrate the launch of an exhibition of photographic portraits which have appeared in the US magazine Vanity Fair over the course of nearly 100 years.
Borrell's ex-girlfriend Camilla Fayed was also at the event.
Pixie Geldof, 17, the daughter of Bob Geldof, mixed with singer and chat show host Lily Allen, 22, and daughter of actor and hardman Keith Allen, who in turn chatted with Kate Sumner, 25, the daughter of Sting.
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Sons of the famous were also there. Otis Ferry, 25, Master of Foxhounds and son of pop singer Bryan Ferry, was also in attendance.
He even brought along his father who at 62 was - how should one put this - one of the older faces in the crowd.
The party was thrown by Graydon Carter, Vanity Fair's flamboyant editor, who flew over from the US to host the event.
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Smile; Lily Allen, right, with Kate Sumner, daughter of rock star Sting, at the National Portrait Gallery for the opening of an exhibition of Vanity Fair photographs
It will be something of a consolation for Mr Carter who last week was forced to cancel the Vanity Fair Oscar night party - normally the hottest ticket on the Hollywood circuit - amid fears that the now settled writers' strike would cancel the Academy Awards ceremony.
The National Portrait Gallery exhibition opens to the public on Thursday and contains 150 portraits taken for Vanity Fair by the likes of Cecil Beaton and Annie Leibovitz.
Like father, like son: Otis Ferry makes an appearance with his rock singer father Bryan, formerly of Roxy Music
Icons: Model Twiggy and her daughter Carly and Rolling Stone guitarist Ronnie Wood's wife Jo and daughter Leah made it a family affair
But actress Emma Watson appeared to fall under the spell of hell-raising rock singer Johnny Borrell when she met him at a London fashion party.
The 17-year-old schoolgirl, in flesh-coloured halter neck dress and killer heels, was soon chatting with the star of the group Razorlight.
Scroll down for more...
Emma Watson has found a new friend...rocker Johnny Borrell of Razorlight fame. The pair were seen at the Vanity Fair event at the National Portrait GalleryMiss Watson's lawyer parents are unlikely to be thrilled at the unlikely pairing.
But the good news for them is that Emma and 27-year-old Borrell had parted company by the early hours of yesterday, by which time he was seen stumbling solo around the Dorchester Hotel.
The actress and the rock star began the evening at the Vanity Fair and Burberry Portraits party at the National Gallery.
Scroll down for more...
Borrell and Emma leave the Vanity Fair & Burberry party to attend a party given by designers PPQ at London's Dolce Nightclub"It was clear they had loads to talk about ? even if they don't look like they have much in common."
The couple shared a cab to another fashion party, thrown by designers PPQ at the Dolce nightclub. From there, they are believed to have gone on to a private event at the Dorchester.
Scroll down for more...
Worse for wear Johnny heads home with with a mystery companion after a heavy night at the Dorchester Hotel..with Ms. Watson nowhere to be seenMiss Watson, who is said to havemade a £10million fortune from the Potter film series, gained ten top-grade GCSEs and hopes to study philosophy at Cambridge.
But in recent months she has been keen to distance herself from her goody-two-shoes image.
Scroll down for more...
It's black and white: Johnny's ex Camilla Fayed opts for a monochrome waitress look, and model Erin O' Connor keeps it simple with stripes and a white coatLondon-born Borrell was blamed for leading the U.S. actress Kirsten Dunst astray when they dated for several months last year.
On one of their nights out, the 24-year-old star looked immaculate on the red carpet at the premiere of Spider-Man 3 ? then was reduced to a giggling, stumbling wreck within hours after sinking numerous cocktails with Borrell.
Scroll down for more...
Frock stars: Lily Allen shines in a floor-length floral prom dress and St Trinian's actress Tamsin Egerton keeps her look undercover in a black belted dress coatJudging by Borrell's perfomance last night, Watson could have her hands full with the hell-raising rock star.
Emma and Johnny turned out at the Vanity Fair party along with a host of stars, including Lily Allen, Pixie Geldof, Twiggy, Bryan Ferry and Will Young to celebrate the launch of an exhibition of photographic portraits which have appeared in the US magazine Vanity Fair over the course of nearly 100 years.
Borrell's ex-girlfriend Camilla Fayed was also at the event.
Pixie Geldof, 17, the daughter of Bob Geldof, mixed with singer and chat show host Lily Allen, 22, and daughter of actor and hardman Keith Allen, who in turn chatted with Kate Sumner, 25, the daughter of Sting.
Scroll down for more...
Sons of the famous were also there. Otis Ferry, 25, Master of Foxhounds and son of pop singer Bryan Ferry, was also in attendance.
Party girls: He even brought along his father who at 62 was - how should one put this - one of the older faces in the crowd.
The party was thrown by Graydon Carter, Vanity Fair's flamboyant editor, who flew over from the US to host the event.
Scroll down for more...
Smile; Lily Allen, right, with Kate Sumner, daughter of rock star Sting, at the National Portrait Gallery for the opening of an exhibition of Vanity Fair photographsThe National Portrait Gallery exhibition opens to the public on Thursday and contains 150 portraits taken for Vanity Fair by the likes of Cecil Beaton and Annie Leibovitz.
Like father, like son: Otis Ferry makes an appearance with his rock singer father Bryan, formerly of Roxy Music
Icons: Model Twiggy and her daughter Carly and Rolling Stone guitarist Ronnie Wood's wife Jo and daughter Leah made it a family affair