News Pop Culture and Entertainment InStyle's May Cover Star Cameron Diaz: Kate Upton's Next Guy Better Watch Out By Kim Peiffer Kim Peiffer Kim Peiffer is a New York-based editor, writer, digital media expert, and on-camera talent who covers beauty, wellness, travel, fashion, and women's lifestyle topics. She was previously a Senior Editor for InStyle, and is currently the Lifestyle Executive Editor for Forbes. InStyle's editorial guidelines Published on April 25, 2014 @ 12:44PM Pin Share Tweet Email Trending Videos Photo: Kristina Bumphrey/Startraksphoto.com In the hilarious new comedy The Other Woman, three gals (played by Cameron Diaz, Leslie Mann, and Kate Upton) end up becoming friends after they come to the realization that they are all dating the same man (Nikolaj Coster-Waldau), leading to a series of laugh-out-loud scenes that entail the ladies plotting their revenge on said unfaithful bad boy. So it comes as no surprise that in real life, these three hoots are just as comical when they are around each other. We learned just that last night when we hung with them at a screening of the film, hosted by The Cinema Society, InStyle and Bobbie Brown at the Paley Center in New York City. The gorgeous trio walked the carpet arm-in-arm, giggling, and hamming it up for the cameras. "I love to laugh. I think that life is hard, and there's difficult points at anytime in your life and laughing is the best medicine," says supermodel Upton, who made her debut acting performance in the film. And since she was a newbie and all, her more-seasoned co-stars made sure to break her in properly — with lots of pranks on set. "When she fell asleep, because she's like a little teenager so she sleeps long and hard, Cameron and I were like, 'what are we gonna do? What are we gonna do?' And so we got her eyeliner and we drew a mustache on Kate's lip and then drew mustaches on ourselves," Mann says. "Then we decided to draw beards, little goatees, on her, so then we drew little goatees on ourselves and then we took pictures." And since both Diaz and Mann feel they have already had their fair share of bad dating experiences, they're turning to Upton to be their romantic Guinea pig. "Kate is still so young we pretty much, we figure that she has a lot of mistakes ahead of her still, and so when she picks a guy that's gonna cheat on her again she's gonna call us and we're going to get revenge on him," Diaz jokes. After a lovely cocktail hour attended by the cast, as well as other stars including a pregnant Doutzen Krous, Gayle King, Russell Simmons, co-host Bobbi Brown, and chef Katie Lee, attendees headed into the theatre for the screening, where an evening of laughter ensued as the girls continued to entertain the crowd on-screen. See more pics from the InStyle party here in our gallery. For more on our cover star Cameron Diaz, pick up the May issue of InStyle, available on newsstands and for digital download. 01 of 07 Kate Upton, Cameron Diaz and Leslie Mann Nicholas Hunt/Patrick McMullan/Sipa USA "Cameron is the most incredible person," Upton tells InStyle. "She's so wise and patient and nice to every single person on set. She's better than I'd ever expect." 02 of 07 Ariel Foxman and Cameron Diaz Nicholas Hunt/Patrick McMullan/Sipa USA Our May Cover girl posed with InStyle's own Ariel Foxman on the carpet before heading into the screening. 03 of 07 Kate Upton, Cameron Diaz, Leslie Mann and Taylor Kinney Nicholas Hunt/Patrick McMullan/Sipa USA What did the cast do in their trailers to pass time in between takes? "Make popcorn and eat popcorn," says Diaz. "I make the best popcorn. I cook all my meals in the trailer. Everybody comes over. We cook!" 04 of 07 Kate Upton and Bobbi Brown Nicholas Hunt/Patrick McMullan/Sipa USA "I'm so excited, this is a perfect first role for me," says Upton (with co-host of the evening Bobbi Brown). 05 of 07 Lindsay Ellingson Monica Schipper/Getty Images The model looked pretty in pink as she arrived on the red carpet with pal Doutzen Kroes. 06 of 07 Doutzen Kroes Mike Pont/FilmMagic The expectant model wowed in a two-piece ensemble, showing off her adorable bump. 07 of 07 Gayle King Kristina Bumphrey/Startraksphoto.com King was all about color in this cheery orange frock.