Jessica Chastain: 'I gave Madonna a spanking'
Taylor Swift isn't the only one to host A-list guest stars.
Jessica Chastain let her inner wild child loose on Saturday night to join Madonna on stage during her concert in Prague -- even giving her Madgesty a spanking!
The Academy Award-nominated actress seemed pretty pleased with herself, posting a video on her Facebook page and writing, "I gave Madonna a spanking & Ive a video to prove it. #rebelheart #unapologeticbitch."