According to the SF Gate (part of the San Francisco Chronicle), Joan Jett had to apologize to Kristen Stewart after reducing the actress to tears on the set of “The Runaways.”

“But the actress allegedly broke down crying after Jett gave her a “hard time” during filming in a bid to improve her performance, prompting the rocker to apologize.

A source tells the New York Daily News, “Joan just wants Kristen to play an authentic version of herself, so she needled her a little bit too much. But she apologized when she realized how upset Kristen got.”