Never underestimate the unduly power of the teenage girl. It was their undying love for romance that finally relegated "Avatar" to the number two spot for the weekend after 7 consecutive weeks in first place. Lasse Hallstrom's "Dear John", starring hunky Channing Tatum and Mamma Mia's Amanda Seyfried, took in an estimated $13.6 million on Friday, its first day in theaters and grossed an estimated $32.4 million in the three-day period since opening. "Dear John" posted the highest Super Bowl opening, not accounting for ticket price inflation, thanks almost entirely to a single demographic: teen and college-age girls. The audience of the Lasse Hallstrom-directed film was 84% female and 64% under 21, according to exit polls.

Sony did an incredible job with marketing by never straying from the core audience of the picture, said Geoff Ammer, president of marketing for Relativity Media, which financed "Dear John". We knew it would be red hot when the trailer played well to audiences before "Twilight", said Sony distribution president Rory Bruer.

Movies that appeal to only one demographic group often fall off fast at the box office, but Ammer said he's hopeful the audience for "Dear John" will expand to older women in the coming weeks.

Relativity said that "Dear John" cost $25 million to make, and the low-cost movie should be very profitable for Relativity as well as Sony. Nevertheless, the earth bound tear jerker cost a fraction of the amount relative to Cameron's sci-fi love story...only about a 465 million dollar difference.

For more on "Dear John", including red carpet interviews with stars Amanda Seyfried and Channing Tatum, exclusive photos, and more, check out IAMROGUE.com.