Wild Act Vol 2 by Rie Takada. A Romance manga rated Older Teen, published in English by Tokyopop in 2003.

Fifteen-year-old Yuniko Sakuraba is an upbeat girl with a knack for swiping belongings once owned by the late actor Akira Nanae. When she runs into Ryu Eba, a 17-year-old movie star, the clash sparks a rivalry that slowly grows into romance. A lively romantic comedy from Rie Takada, creator of Happy Hustle High.