Actress Emily Mortimer cocreated the HBO series Doll & Em with her real-life best friend Dolly Wells. The show, which airs Sunday nights on HBO, chronicles the ups and downs of the personal and professional lives of Emily and Dolly's characters. Since Emily works alongside such a close pal, we figure there's no one better to ask about issues that come up for female friends. During Emily's recent visit to our New York studio, we asked for her perspective on five issues that affect BFFs.