The movie version of the fluffy romantic musical Mamma Mia! has become Britain's biggest box office hit of all time, E! Online reports. The Meryl Streep flick, based on the tunes of the '70s Swedish pop group ABBA, earned $107.7 million in 22 weeks in theaters, sailing beyond the 1997 epic Titanic. A studio exec said the movie’s “pure escapism” appeals to audiences who want to forget about the bleak economy.