The pop singer and her actor ex-boyfriend were photographed arriving separately to the Peppermint club in West Hollywood, California, both attending jewelry designer Jennifer Meyer's star-studded 40th birthday party.
Meyer, who separated in October from actor Tobey Maguire after nine years of marriage, had quite the guest list at her big bash, including Jennifer Aniston and husband Justin Theroux, who came with Aniston's BFF, Courtney Cox.
Gwyneth Paltrow was also present, who cozied up to her pals Demi Moore, Sara Foster and the birthday girl herself for a group photo.
"I went out on a Saturday night and lo and behold, some of my best girls had up and done the same," the Iron Man actress wrote on Instagram.
Moore, 54, looked particularly incredible in a flowy blue dress and a pair of chic glasses.