Futari no "Rikako"

She has always been a fan of Rikako, the model. She even had a chance to introduce herself to her idol. A few years later... She meets Alice, a Persian cat. She meets Alice's human master... a photographer. It turns out later that he was Rikako's boyfriend before she married. Rikako, unhappy with her marriage to a wealthy company President, runs to her ex for comfort.

(Source: PRISMS: The Ultimate Manga Guide)