Rachel McAdams attends Lionsgate and Roadside Attraction’s premiere of ‘A Most Wanted Man’ hosted by The Cinema Society and Montblanc at Skylark on July 22, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

Rachel McAdams for ‘Allure’ (Courtesy of Carter Smith for Allure)

Rachel McAdams for ‘Allure’ (Courtesy of Carter Smith for Allure)

Rachel McAdams (Pacific Coast News)

Rachel McAdams, in Ralph Lauren, attends the ‘Charles James: Beyond Fashion’ Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Jamie McCarthy/FilmMagic)

Rachel McAdams at a special screening of ‘About Time” in Germany (FameFlyNet)

Rachel McAdams attends the ‘About Time’ world premiere at Somerset House on August 8, 2013 in London, England (Getty)

Rachel McAdams attends the ‘About Time’ world premiere at Somerset House on August 8, 2013 in London, England (Photo by Gareth Cattermole/Entertainment/Getty Images for Universal Pictures)

On her hair: “I always wanted pink hair. I wanted to do my whole head, but my hairstylist, Robert, was like, “How about we start small?” I absolutely loved it. I still think about doing blue at some point, but I don’t like to change my hair before I’m about to do [a film] — you never know what that character’s going to be.”

On dating her co-stars: “A set may seem like a good place for romance, but I don't think it's very conducive; it's too distracting. Every relationship I've had with a coworker has come after the fact, because you wind up actually spending a lot of time with those people promoting the movie.”

On her beauty looks during her figure skating days: “I definitely was in the sequined, bedazzled era. We would put blue eyeshadow up our eyebrows, and glitter all over our faces. I probably put more effort into my skating outfits than my clothes.”

On why she has so many buns in her hair during her interview: “This is not meant for public viewing! This is just how I dry my hair. All my friends make fun of me and call me Helga or Heidi.”

The actress is on the cover of ‘Glamour’ magazine’s February 2012 issue and she’s revealing her biggest beauty secrets — starting with why her hair is styled in tons of buns during her interview!

Rachel McAdams has dyed her hair hot pink, peach, brown, blonde & more, so it’s safe to say she’s not scared of taking beauty risks, but you’ll never believe why she wore blue glitter in her brows.