"Everyone's here!" exclaimed Julianne Moore at the New York premiere of her latest film, Trust the Man, on Monday. "My parents, my in-laws, and even my son." As if on cue, the flame-haired Cal Freundlich, 9, appeared with a disposable camera to document the evening, which was hosted by Calvin Klein and The New York Observer.

Like the party celebrating it, the movie, which dissects New York relationships through the stories of two spoiled couples, is a family affair. Written and directed by Moore's husband, Bart Freundlich, the romantic comedy introduces the couple's daughter, Liv, as well as the multitasking Cal. "The kids were great," said Freundlich. "The only thing is, my son only ever does anything once."

It's just as well, since Cal's star turn comes when he punches David Duchovny, Moore's on-screen husband, in the nether regions. Somewhat less painful are the frat-boy antics of Billy Crudup's death-obsessed Tobey. "I play a ridiculous character, and that can be fun," said the actor. "I didn't draw too much from real life, but my friends might disagree with that!"

After grazing on Asian delicacies in take-out boxes at the Chelsea nightspot Home, Téa Leoni, along with Eva Mendes and a very pregnant Maggie Gyllenhaal (who plays Crudup's baby-hungry girlfriend in the movie), celebrated Duchovny's 46 big ones with a cake and a rousing rendition of "Happy Birthday." Shortly after, the Moore-Freundlich family left. Cal, after all, had to get to bed.

— Jessica Ramakrishnan