It's an audience - approved template that Wiig (who co-wrote the screenplay with Annie Mumolo) has
little problem personalizing, sincerely and ridiculously confronting issues of beauty, wealth, loyalty, monogamy, marriage, and sex through the tale of a character whose life spirals downward after her best friend, Lillian (Maya Rudolph), gets engaged and she's forced to battle for sole possession of BFF status with Lillian's glamorous and wealthy
new sidekick, Helen (Rose Byrne).