Ashton Kutcher in DKNY. Photo: Mike Coppola, WireImage

"I'm not the star of this film," insisted Ashton Kutcher at the Cinema Society screening of his just-opened film, "No Strings Attached." "Natalie Portman is an absolute rock star, and for me, this film was an opportunity to star with Natalie Portman."

The rock star in question may have been absent from the screening -- she is several months pregnant, after all -- but that didn't stop stars of both the cinematic and stylish varieties from coming out to the Tribeca Grand for the event.

Donna Karan, a longtime friend of Kutcher's and his wife, Demi Moore, offered her DKNY Jeans brand as a sponsor of the evening, with fellow designers Rachel Roy, Nicole Miller, and even Theory's Olivier Theyskens turning up to catch a peek at the Kutcher-Moore duo.

On the celeb front, Gabourey Sidibe, Olivia Palermo, and Kelsey Grammer (with daughter Spencer and fiancée Kayte Walsh) caught Soho Grand afterparty, sponsored by DeLeón Tequila.

"Ashton is so handsome and sweet. He's a really good guy," gushed Kutcher's hilarious co-star in the film, Greta Gerwig. In the film, Gerwig's character is Natalie Portman's best friend, and she's also dating Kutcher's best friend -- a foursome that was familiar to the actress. "In college, me and my roommate were dating two guys who were also roommates. It was very convenient for everyone involved!" She laughed. "And, neither one of us broke up until after college. We stayed together the whole time, so all the messiness was afterward."

Gerwig stayed true to the evening's sponsor by sporting a Donna Karan coated lace minidress. "It doesn't look like what I think of when I think of Donna Karan," she said. "It's a little punkier. There's like rubber on it! I thought it was really cool."

Saturday Night Live darling (and current Fred Armisen squeeze) Abby Elliott, 23, sporting Topshop and hot pink pumps, dished on her role in the film as well: "My character works in the restaurant where Ashton and his buddies come a lot. He ends up hooking up with her one night, but she's with another girl that she likes a little more than him!" There was no chance of her character becoming the Friend With Benefits, she explained: "I'm a lesbian in this movie!"