Along with a few other girlfriends, the blonde beauties dined at the Dirty French. According to an eyewitness, the trio was seated at a booth in the back of the restaurant, appearing "really giddy and excited to be having a girls' night out."
Barrymore was the first to leave, according to the eyewitness, while Diaz and Paltrow were all smiles as they left the bistro together.
Paltrow is in town to promote her pop-up shop, goop mrkt, which is open until Dec. 24 at The Shops at Columbus Circle. She took to Instagram to share a photo with her 1.5 million followers, noting that she'd also be signing copies of her New York Times best-selling cookbooks, It's All Good and My Father's Daughter.
Paltrow, Diaz and Barrymore have been close for years, and the three not only support each other's careers, they also stick up for each other. That's what friends are for, after all.
Back in 2014, Diaz appeared on KIIS 106.5's Kyle & Jackie O show, but cut her interview short when one of the hosts made a dig at her Charlie's Angels co-star.
"[The Drew Barrymore] drug years were a great thing to watch, but not so good to be in, I'd imagine," co-host Kyle Sandilands joked. Diaz, however, didn't find much humor in his statement.
"I'm sure, Kyle, you've never been through a drug phase, have you? Or alcoholism or anything like that? Pretty clean; always did it right? Congratulations," Diaz replied, clearly not OK with having anyone speak badly about one of her best pals.
Like any other group of friends, they also help each other out in times of need. Barrymore and Paltrow, who are both mothers to two children, have been open about sharing their mutual struggle with postpartum depression recently.
ET caught up with Paltrow in October at the La Mer Celebrates 50 Years of an Icon event, where she was candid about the mood disorder both she and Barrymore dealt with after giving birth to their second children.
"Luckily, [my case] was low grade enough that I didn't have to be hospitalized, but it's a very debilitating thing, and I think there's so much shame around it and there shouldn't be," Paltrow told ET. "It's something that happens, it's something that befalls many women after they have a baby, and for me, it ended up being a wonderful opportunity to explore some underlying issues that I think the depression kind of brought out."