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.
A source tells ET that Stefani, 46, left the Casamigos party alone around 1:30 a.m., and headed straight to Jared Leto's house party in the Hollywood Hills. Shelton was already there when she arrived, according to the source, along with Leonardo DiCaprio, Paris Hilton, Ed Westwick, Fergie and Josh Duhamel.
Stefani stayed for about 40 minutes, then left the house holding Shelton's hand. According to the source, the 39-year-old country singer was walking behind her as she guided him through to exit. Shelton and Stefani apparently let go of each other's grasp, however, when they noticed a photographer in sight.
While there have been rumors that the two are romantically linked, this could very well be one of Shelton's publicity stunts. After all, messing with the paparazzi is kind of his thing. Watch the video below to see Shelton fool the paparazzi back in July, when he stepped out with a baby stroller following his divorce from Lambert.