Her promising portrayal of the titular character in Nobuta wo Produce won her a Best Supporting Actress award from Japan's Television Academy Awards.
Koji Yamamoto is known as a playboy in real life and this wasn't the first time he hit if off with his theater play female costar.
He once dated Takako Matsu(松たか子) after working with her in the theater play "The Orchestra Pit" back in 2000.
However, the two ended up breaking up a year later after he was caught cheating behind her with actress Riho Makise(牧瀨里穗).
On the other hand, Miki Horikita has been rumored to be dating Japanese pop group Arashi(嵐)'s Sho Sakurai(櫻井翔) in recent years.
It is said that Koji didn't pursue Maki until after the theater play ended in June.
Many netizens were surprised by the sudden marriage announcement since they have only dated for roughly two months.
Produced by WOWOW FILMS, the movie was screened at the Berlin Film Festival in the Panorama category.
In 2012, Horikita was offered to lead the cast of an NHK asadora named Umechan Sensei .
She took turns with Erika Toda, Yui Aragaki, Chiaki Kuriyama, Nana Eikura, and Kii Kitano until she left the program in 2009.