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Julianna Guill played the character Becca Riley, who was a younger sister to the main protagonist, Abby McCarthy, portrayed by Lisa Edelstein. Becca was depicted as a free-spirited and somewhat reckless individual who often found herself in challenging situations.

Throughout the series, her character went through various ups and downs as she navigated relationships, career choices, and personal growth. Becca's storyline on "Girlfriends' Guide to Divorce" revolved around her search for identity and purpose, with her sister Abby often trying to guide and support her.

Guill's portrayal of Becca brought a mix of vulnerability, humor, and occasional drama to the show. As a recurring character, Guill's appearances spanned multiple seasons of the series, allowing her character's development to unfold over time.

Her performance added depth and complexity to the ensemble cast of Girlfriends' Guide to Divorce.