POWER OF THE PEN: A phalanx of film and television stars descended on Broadway’s American Airlines Theatre on Monday evening as Montblanc presented a new edition of “The 24 Hour Plays,” benefiting the Urban Arts Partnership. Jennifer Aniston, Demi Moore, Ashton Kutcher, Naomi Watts, Brooke Shields, Eva Mendes, Rosario Dawson, Julia Stiles, Liev Schreiber, Emmy Rossum, Billy Crudup, Amber Tamblyn and others acted in six short plays — ranging from farcical to sweet to lewd — which had been written just hours earlier. As the evening’s sponsor, Montblanc was able to force the audience to sit through one play that was all about its own pens — and even had Moore and Stiles star in it. In the show notes, actor David Cross joked that he now had “a sweet Montblanc pen for sale! See me after the show.” Meanwhile, Aniston wrote: “I’m just so excited to maybe work with Rosie Perez for a second time. I want to be her when I grow up.”