Meryl Streep's Rocker in 'Ricki and the Flash' Based on Diablo Cody's Mother-in-Law

Meryl Streep, seen in this exclusive poster for the upcoming Jonathan Demme film Ricki and the Flash, is evoking a real-life rocker mama.

Screenwriter Diablo Cody tells Yahoo Movies that the character of Ricki (Streep) is inspired by Cody’s mother-in-law, Terry, who is the lead singer in a Jersey Shore rock band called Silk and Steel. Flash, also starring Sebastian Stan, Kevin Kline, and ‘80s rocker Rick Springfield, is about a traveling musician who comes home reconnect with her family.

“Terry is a grandmother of six and she’s still up there rocking out every weekend, walking on the bar, just electrifying the audience,” adds Cody, who won an Oscar for 2007’s Juno.