"The Voice" coaches may be at each other's throats on the show, but they're certainly good friends outside of it. Blake Shelton and Gwen Stefani enjoyed each other's company in Halloween, dropping by two rocking parties together in one night.

According to a report from ET Online, the pair fuelled more romance rumors as they were spotted out and about during Halloween night. Both musicians were in full costume, with Shelton throwing on a Mexican Serape poncho and Stefani going as a bloody cowgirl.

The two were spotted first at George Clooney's Casamigos party at Beverly Hills, Calif. Although they were both at the A-List get-together, the co-workers arrived separately and didn't engage in any PDA. Shelton, 39, and Stefani, 46, also left the party separately, but caught up with each other in another high-profile bash: Jared Leto's soiree in Hollywood Hills.

A source told ET Online that the rumored couple left the party holding hands and "looked happy," but quickly let go when they realized a photographer was snapping pictures nearby. They got in a hired car together with Stefani slipping into the back seat and Shelton taking a seat in front of her.

Speculation of a relationship between the two "The Voice" coaches has been circulating since their respective divorces from exes Miranda Lambert and Gavin Rossdale. The chemistry between the two is apparent on the show, but they've also been outspoken about the tight-knit family the entire show has become.

In an interview with ET Online, Stefani said, "We're all having so much fun on the show. Everybody's in such a good place."

Part of the fun probably means steering clear of serious topics like divorce, according to a report from Hollywood Life. A source revealed that Shelton in particular doesn't like being a downer and discussing his divorce with his "The Voice" pals, including Stefani.

"Blake doesn't really bring his divorce talk to her; he tries to make the day on set fun by telling jokes and being a goofball," the insider explained. "It's more important for him that everyone is in a good mood."

The source added, "Blake loves talking to Gwen and talking to her about music and everything else, except divorce talk. Blake doesn't like talking about divorce because it gets him to think about his divorce, and he wants to move forward instead of backwards."

Do you think Shelton's thinking about moving on with Stefani? See the two display their chemistry in a hilarious rendition of "Hotline Bling" at "The Tonight Show Starring Jimmy Fallon."