Instead, the actress was finally meeting close pal Drew Barrymore's newborn daughter Frankie, who arrived Tuesday.
"I haven't seen her yet but I'm going to this weekend," she told PEOPLE Thursday at the Cinema Society and Bobbi Brown New York screening of the movie, which opened in the top spot at the box office. "[Drew] is doing wonderful[ly]."
Fresh off promotional duties for the film, Diaz, 41, joked that she was ready to move onto her next role. "Of course [I'll babysit]," she said. "I'm an auntie!"
Called "down-to-earth" by her Other Woman costar Taylor Kinney, the fun-loving star recently admitted she loves playing pranks – even on unsuspecting infants, as Jimmy Fallon's daughter Winnie learned the hard way.
"She fell asleep first. That's what happens when you fall asleep at a party," Diaz explained on The Tonight Show before revealing she had dipped Fallon's baby girl's hand in warm water to make her pee her pants. Luckily, Winnie was wearing a diaper!