Blake Shelton and Gwen Stefani can't stop smiling as they leave Halloween party together

Blake Shelton and Gwen Stefani have re-sparked those recent dating rumors.

"The Voice" coaches spent all of Friday evening together, dressed up in full Halloween attire as they attended two A-list parties in Los Angeles.

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PHOTOS: Gwen Stefani, Blake Shelton & More Attend George Clooney's Halloween Party

Stefani stepped out as a sexy (and bloody!) cowgirl, while Shelton wore a Mexican Serape poncho over a flannel shirt and a red-and-white trucker hat. The two started their night off at George Clooney's Casamigos Halloween Party, arriving separately to the bash that was held at a private residence in Beverly Hills, California. An eyewitness tells ET that the two didn't show any signs of PDA at the star-studded soiree -- but that apparently wasn't the case later on in the night.