If you always thought the Harry Potter set was all wand waving and polite chit-chat, think again - it was rife with unrequited love.

Emma Watson has admitted she had a huge crush on her co-star Tom Felton, who played evil Draco Malfoy in the hit movies.

Opening up about her secret desire for Tom, she tells Jonathan Ross: "Between the ages of 10 and 12 I had a really terrible crush on Tom Felton, to the extent that I would go into work in the morning and look down the numbers on the call sheet to see if he was going to be in.

"We love a bad guy, he was a few years older and he had a skateboard - and that just did it really."

We can't imagine her fellow Gryffindors being very happy about that romance.

Last year, that cad Tom revealed Emma's secret, insisting he had known the whole time that the star, who played geeky Hermione Granger, had the hots for him - but he was too busy lusting after the much older Helena Bonham Carter.

He told the Metro: "We've been friends for a long time and it's very flattering. I had a little boy crush on Helena Bonham Carter - she's a very beautiful woman."

Emma's chat with Jonathan Ross will air on ITV on Saturday night.

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• Style Evolution: Emma Watson

  11 November 2001. Watson practices a fashion pose on in a mixed green ensemble at the New York premiere of Harry Potter and the Philosopher's Stone.

• Style Evolution: Emma Watson

  2001. Eleven-year-old Emma Watson was spellbinding when she hit the big screen as Hermione Granger in the J.K. Rowling film adaptation of Harry Potter and The Philosopher's Stone.

• Style Evolution: Emma Watson

  14 November 2002. Brunette Beauty The actress gets a little bit bohemian in a brown paisley dress with matching leather jacket and boots at the Harry Potter and the Chamber of Secrets premiere in Los Angeles.

• Style Evolution: Emma Watson

  2 November 2002. With a wave of a wand, Watson grows up before our eyes. The young starlet wore this sleeveless white dress, strappy black heels, and a gold clutch to the London premiere of Harry Potter and the Chamber of Secrets.

• Style Evolution: Emma Watson

  11 December 2003. Watson's cute smile and rosy cheeks offset her cargo pants and long leather coat at the London premiere of Lord of the Rings: The Return of the King.

• Style Evolution: Emma Watson

  30 May 2004. Belle of Hogwarts Looking positively ladylike in a floor-length burgundy dress with pinned up hair at the Harry Potter And The Prisoner Of Azkaban premiere in London.

• Style Evolution: Emma Watson

  21 May 2004. Watson opts for a bright red Sgt. Pepper's-inspired jacket while visiting MTV's Total Request Live with Daniel Radcliffe in New York City. She kept her look laid back with flare leg jeans and Converse sneaks.

• Style Evolution: Emma Watson

  26 March 2004. Casual Cutie Watson's age-appropriate ensemble of a floral top, blue jeans, and flat boots is a winner at the Scooby-Doo 2: Monsters Unleashed premiere in London.

• Style Evolution: Emma Watson

  19 November 2005. Watson ditches the Chuck Taylors for adorable flats and a darling beige dress with black ribbon sash at the Tokyo premiere of Harry Potter and the Goblet of Fire.

• Style Evolution: Emma Watson

  October 2005. Alongside co-stars Rupert Grint and Daniel Radcliffe, Watson shows off her toyboy charms in a slate blue dress with Converse sneakers at the Harry Potter And The Goblet Of Fire premiere in London circa.

• Style Evolution: Emma Watson

  4 July 2007. Her casual L.B.D. is made even more louche with a white T-shirt and flat shoes at the photo call for Harry Potter and the Order of the Phoenix.

• Style Evolution: Emma Watson

  June 2007. The rising star dresses in a tulle and feather Chanel concoction fit for a wizard at the Raisa Gorbachev Foundation Party.

• Style Evolution: Emma Watson

  February 2008. The actress, seen here at age eighteen, begins a new relationship with Burberry (where she will eventually become the face of the house. Watson was attending the opening of a Vanity Fair exhibition of photographs in London.

• Style Evolution: Emma Watson

  September 2008. Watson's curious fashion nature continues in an ethereal white column by Alexander McQueen at the National Movie Awards in London circa.

• Style Evolution: Emma Watson

  3 June 2009. At a private dinner for Rodarte designers Kate and Laura Mulleavy, Watson wears one of their Japanese anime-inspired dresses from the spring 2009 collection. The event took place at Harvey Nichols in London.

• Style Evolution: Emma Watson

  8 July 2009. Watson looks all grown up in a Christopher Kane dress and Charlotte Olympia heels as she visits the Late Show With David Letterman in New York City.

• Style Evolution: Emma Watson

  2010. Emma steals the show at the premiere of the final Harry Potter film, Harry Potter and the Deathly Hollows Part 1. The 20 year old actress looks stunning in a Rafael Lopez dress and Charlotte Olympia heels. The super sleek pixie crop completes this chic look perfectly.

• Style Evolution: Emma Watson

  2011. Emma at My week with Marilyn premiere wore a beautiful Jason Wu embellished top, paired with black mini skirt and skinny bow-front belt. Classic satin ankle-strap heels, a leopard print Charlotte Olympia clutch.

• Style Evolution: Emma Watson

  2011. There's no denying that the Harry Potter star looked gorgeous as she stepped out in a backless, bejewelled corset dress at a Lancome event in Hong Kong.

• Style Evolution: Emma Watson

  July 2011. Emma wears a grey tulle dress to the world premiere of <em>Harry Potter and the Deathly Hallows - Part 2</em>.

• Style Evolution: Emma Watson

  Emma arrives at the North American premiere of <em>Harry Potter and the Deathly Hallows - Part 2 </em> wearing this golden dress with smoky eye make-up.

• Style Evolution: Emma Watson

  April 2012. Emma adds a bit of attitude to her cute floral ensemble with a peplum leather jacket.