She's famous for her role in the fantasy Twilight films.
But for her latest movie Kristen Stewart, 19, has taken a reality check and plays iconic rock star Joan Jett of the Seventies band The Runaways.
The pair posed together on the red carpet of the film's Hollywood premiere, but Joan, 51, threatened to almost upstage the young ingenue as she showed off an amazing youthful look.
I love looking good: Kristen Stewart poses with a youthful looking Joan Jett. Stewart plays the rocker in new film 'The Runaways' which had its Hollywood premiere, last night
Rocking it: Joan Jett (L) poses with Kristen Stewart who plays her in the film The Runaways while Dakota Fanning with her real-life counterpart Cherie Currie (R)
The real Runaways: (From left) Sandy West, Joan Jet, Lita Ford, Jackie Fox, and Cherie Currie, pictured in California in 1977
And Kristen looked rather more cheerful than usual in a coral pink dress as she arrived at the Cinerama Dome Arclight Theatre.
Her Twilight co-star Taylor Lautner also came along to the event, although her boyfriend Robert Pattinson - also of Twilight fame - was not there.
Co-stars: Twilight star Kristen flashes a rare smile and stood out in a coral pink dress at the film's second premiere last night in Hollywood
Red carpet display: Kristen pulls a funny face as she stands next to Dakota
Jett, 51, who founded The Runaways along with drummer Sandy West, has been a huge help to Kristen throughout the filming of the biopic.
While on US TV's The Tonight Show with Jay Leno this week, Kristen said of the role: 'I was really lucky to have her [Jett] be so into the project and so open about it, because not a lot of people my age know about The Runaways.
'It was the most important part of her life and kick-started her career.
For the fans: The actress signs her autograph for the waiting crowd
Support: Her Twilight co-star Taylor Lautner came along too, but Kristen's boyfriend Robert Pattinson, also of Twilight fame, was not there
'And also, they were the first girl band. They were the first girls to ever play aggressive, sexual assertive rock and roll.'
The Runaways were an American all-girl teenage rock band, on the music scene between 1975 to 1979.
The band is best known for the songs Cherry Bomb, Queens of Noise, Rock n Roll, Neon Angels (On the Road to Ruin) and Born to Be Bad.
Girls on film: (From left) Dakota Fanning (Cherie Currie), Alia Shawkat (fictional character Robin), Scout Taylor-Compton (Lita Ford), Michael Shannon (producer Kim Fowley), Stella Maeve (Sandy West) and Kristen Stewart (Joan Jett)
In January the film got its first premiere at The Sundance Film Festival to rave reviews.
Critics have hailed Stewart's and Fanning's performances as 'fantastic' with the movie being described as authentic to the Seventies era.
Actress Stella Maeve plays Sandy West, Scout Taylor-Compton is lead guitarist Lita Ford, and Michael Shannon as producer Kim Fowley.
Glamorous: Elvis's granddaughter Riley Keough (L) plays Marie, the twin sister if Cherie, and (R) co-star Scout Taylor Compton
And Elvis's granddaughter Riley Keough also has a part, as Cherie's twin sister Marie.
The film is partially based on lead singer Cherie's 1989 autobiography Neon Angel: The Cherie Currie Story.
The book tells the story of her difficult upbringing, the group's meteoric rise to fame and her subsequent battle and recovery from drug and alcohol addiction.
Night at the movies: Joan Jett (L) is an executive producer on the film and (R) Kayla Ewell, star of The Vampire Diaries
Smiling trio: Ryan O'Neal and with daughter Tatum (left) and a mystery woman