The 2011 romantic comedy, "What's Your Number?" focuses on newly single Ally Darling who begins to round up all of her old flames, hoping to determine if the right one got away. Enlisting the help of her neighbor, Colin, Ally begins to accumulate her exes while challenges abound.
Ally Darling, played by actress Anna Faris, has entered a rough stage in her life. Her boyfriend abruptly ends their relationship, and she is fired from her job. Coming across a Marie Claire spread, Ally uncovers an article detailing that women with over 20 lovers experience complications in acquiring a husband; Ally's list stops at 19. After an unexpected one-night stand with her ex-boss, Roger, Ally's list of lovers reaches 20, and she begins to seek out her old romances to see if one of them is marriage potential to avoid being intimate with anyone else.
On her quest, Ally teams up with neighbor Colin Shea, played by actor Chris Evans, to help her locate the men. Along the way, she investigates the current lives of her exes and even rekindles with an old flame, Jake Adams. She begins to question whether or not this journey can lead to the man of dreams or if he has been with her all along.