Glamorous French woman who becomes Charlie's new partner in Paris. Her presence triggers Kate's jealousy but also catalyzes Kate's personal growth.
Charlie falls in love with Juliette, travels to Paris with her to meet her parents, and eventually reconciles with her at the airport.
Luc goes to bed with Juliette to distract her but stops when he accidentally calls her Kate, revealing his shifting affections.
Juliette's presence triggers Kate's initial jealousy, prompting Kate to later claim Luc is her lover to make Charlie jealous.
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