It was apparently taken during a dinner on April 17, reports aceshowbiz.com.
In the photo uploaded on her Instagram, the "Shakespeare in Love" star can be seen posing with Nicole Richie, Stefani, Stella McCartney, Naomi Watts, Sam Taylor-Wood and Chelsea Handler.
McCartney had also shared a photo from the dinner in which the stars struck different poses.
"Gals night out! Gwen, Gwyneth, Nicole, Chelsea, Naomi, Sam and I...," she wrote.