The Tony-winning actress walked into the audience and took the cellphone from an audience member who kept texting in the middle of play "Show for Days", reported Ace Showbiz.
Following the incident, LuPone issued a statement, "We work hard on stage to create a world that is being totally destroyed by a few, rude, self-absorbed and inconsiderate audience members who are controlled by their phones. They cannot put them down.
"When a phone goes off or when a LED screen can be seen in the dark it ruins the experience for everyone else - the majority of the audience at that performance and the actors on stage.