The actress, 48, has lightened her locks, with blonder highlights framing her face.
Aniston matched her new hairstyle with a curve-hugging LBD featuring a long-sleeve detail and accessorised with gold hoop earrings and strappy black heels.
The star even coordinated with husband Theroux, 45, who wore a black suit with matching skinny tie.
The former Friends star was sporting darker locks back in February when she attended the 2017 Vanity Fair Oscar Party in February.