Comedy written by and starring Kristen Wiig as a hapless maid of honour struggling to keep things on an even keel in the lead up to her best friend's wedding. Annie (Wiig) is still reeling from the failure of her bakery business and the subsequent loss of her boyfriend and all her savings when her best friend, Lillian (Maya Rudolph), announces that she is engaged and wants Annie to take charge of her pre-wedding preparations. As if the responsibility of the role at such a tough time wasn't trying enough, Annie faces the small matter of dealing with Lillian's other bridesmaids - led by Helen (Rose Byrne) and Megan (Melissa McCarthy) - who have their own ideas on the kind of events befitting Lillian's final weeks as an unmarried woman. As a variety of mishaps, including mass food poisoning and a plane grounding, riddle Annie's attempts to help, she gradually finds herself usurped by Helen. But will her loyalty to Lillian pull her through in the end?