Gwen Stefani and Blake Shelton attended George Clooney’s Casamigos Tequila Halloween bash in Beverly Hills, Calif., over the weekend, fueling rumors that The Voice mentors are dating.

Gwen Stefani, Blake Shelton Halloween Date

Stefani and Shelton both showed up at Clooney’s party Saturday – though they were careful to arrive separately. The former No Doubt frontwoman seemed inspired by her rumored new beau for her Halloween costume, donning a cowgirl ensemble for the fete. As for Shelton, he threw on a poncho, a trucker hat and a large beard to resemble Forrest Gump on his run across America.

Apparently after making an appearance at Clooney’s party, the singing duo separately headed over to a Halloween party at Jared Leto‘s house in the Hollywood Hills. When it was time to leave, Shelton and Stefani left the bash together hand-in-hand, a source told Entertainment Tonight. The two reportedly dropped each other’s hands when they spotted a photographer, but still got into the same car to leave the festivities.

Last month, sources claiming to be close to the couple said that the onscreen flirting wasn’t an act and that the two had embarked on a romantic relationship after getting to know one another through The Voice. “They’re a real thing,” a source told Us Weekly.

The rumors first started back in September with insiders claiming that the two were finding it hard to keep the relationship a secret.

“They’re trying to keep it on the down-low, but it’s not happening partly because they’re all over each other,” a source told Life & Style. “The chemistry between them is off the charts. Everyone on set sees that Blake and Gwen are falling for one another.”

“When they’re not together, Blake has been calling her, too,” the insider added. “He’s even given her some small gifts. He sees Gwen as the ultimate woman, and she has been reveling in the attention.”

Both Shelton and Stefani are newly single after splitting from their respective spouses. The country crooner finalized his divorce from ex-wife Miranda Lambert in July, while Stefani and estranged husband Gavin Rossdale announced their divorce after 13 years of marriage in early August.

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