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Taylor Swift isn't just opening up to her diary anymore. Now she's sharing with E!

Check out a sneak preview of the title tune from her upcoming album, Speak Now, right here, and tune into E! News tonight at 7 p.m. and 11:30 p.m. to watch our exclusive sit-down with the 20-year-old star.

Swift says "Speak Now" is inspired by a friend's experience with a childhood sweetheart who, just as she thought they were getting back together, told her he was engaged to someone else.

"You know, 'speak now or forever hold your peace,'" she explains. The song will be available on iTunes starting Tuesday.

Keep watching E! News for more Swift exclusives leading up to Speak Now's Oct. 25 release, including previews of "Back to December" (Oct. 11), "Mean" (Oct. 18) and "Story of Us" (Oct. 22).

For more exclusive Taylor Swift videos, check out www.xfinitytv.com