By Samantha Simon
Updated Nov 18, 2014 @ 5:15 pm
Credit: Dimitrios Kambouris/Getty Images for Montblanc

When Melanie Griffith hit the Broadway stage with Laverne Cox and Pablo Schreiber last night, we knew to expect the unexpected. The trio opened up the 14th annual 24 Hour Plays, a production presented by Montblanc in which six short plays are written, rehearsed, and performed in a 24-hour time period to benefit Urban Arts Partnership, which provides arts education for students in New York City's underserved public schools. . On stage, things heated up quickly between Orange is the New Black costars Cox and Schreiber.

Credit: Andrew H. Walker/Getty Images for Montblanc

“We actually didn’t kiss in rehearsal, and then we just went at it in the show,” Schreiber said of the pair's makeout sesh at the American Airlines Theatre in New York City. For Cox, the fun was all in the day-long preparation. “I loved running the scenes over and over again with Pablo and Melanie,” she said.

Credit: Andrew H. Walker/Getty Images for Montblanc

Another one of the night’s most unforgettable moments came when Amanda Seyfried (starring alongside her boyfriend, Justin Long) serenaded Game of Thrones Peter Dinklage with opera-style renditions of two versions of “Shake It Off.” The duo debated which was the better track: Taylor Swift’s current hit versus Mariah Carey’s 2005 jam of the same moniker.

Credit: Instagram/mingey

And the comedy didn’t stop for Seyfried and Long when they exited the stage. In the next play, The Hangover’s Justin Bartha and 30 Rock’s Katrina Bowden mocked the real-life couple, who laughed as they took in the performance next to Jennifer Aniston and Justin Theroux. “Every Justin in Hollywood approved,” Bartha said of his portrayal of Long in the act.

Credit: Dimitrios Kambouris/Getty Images for Montblanc

After putting in a full 24 hours for a good cause, the sleep-deprived stars celebrated at B.B. King Blues Club, where DJ Samantha Ronson's mix of tracks kept everyone awake and dancing.