AceShowbiz -

Following the addition of Scout Taylor-Compton, two more actresses are said to be joining the cast of "The Runaways". Latino Review broke the news of Alia Shawkat's casting, whereas Life & Style came out with the story that Tatum O'Neal has been tapped to star in the biopic movie.

Shawkat who plays acerbic teenager Maeby Funke in FOX's comedy series "Arrested Development" reportedly will be playing a character named Robin. Latino Review describes Robin as an 18-year-old tall and slender bass player who is the oldest and most feminine of the band, hinting further that the character may have been created in essence of the band's original Micki Steele.

Meanwhile, Academy Award-winning O'Neal will take the role of a mother. The 45-year-old daughter of actor Ryan O'Neal allegedly has been cast to play the mother of Dakota Fanning's character, Cherie Currie.

Previously, "H2: Halloween 2" star Scout Taylor-Compton confirmed through her MySpace that she has secured the role of guitar icon Lita Ford for the movie. "hey guys! I have some pretty exciting news! I have recently been filming my ass off on my newest project 'The Runaways'!!" she wrote. "So far the process has been amazing, I am so lucky and honored to be able to portray the guitar icon Lita Ford!"

"The Runaways" centers its story around a '70s girl band of the same name formed by Joan Jett and Cherie Currie. The movie will follow the teenage band as they experience meteoric rise, and chronicle their dissolution and disillusionment. Jett herself will serve as the film's executive producer and Floria Sigismondi will direct in addition to penning the script. "Twilight" beauty Kristen Stewart is set to portray Jett.