Gwen Stefani turned things up a notch when she sang Drake's "Hot Bling" to Blake Shelton on the Oct. 26 episode of "The Tonight Show Starring Jimmy Fallon."

HollywoodLife.com shared that the two would have been kissing if Gwen had gotten any closer to her fellow "The Voice" coach. "And I know when that hotline bling," Gwen is seen singing to Blake - in the sexiest, most suggestive, way we've ever seen the song sung - in the video above," the news outlet reported. "And as she moves closer to him, he quickly fires back, "bling!" Clearly, he wants to know what happens when that hotline bling. Hot damn - we can imagine Blake had to take a cold shower after that performance."

All four coaches of "The Voice," namely Gwen, Blake, Pharrell Williams and Adam Levine, appeared alongside Jimmy Fallon on the late night talk show. They all made a surprise appearance and played a game of "Spin The Microphone."

The "Happy" singer requested Gwen to sing "Hotline Bling" and that was when Jimmy pointed to Blake for the reasons that he wanted them to sing together. Blake then screeched but Gwen jumped up and down in exhilaration. The chemistry between Blake and Gwen was undeniable when they performed.

To recall, the two have been flirtier than ever on "The Voice" lately. The country king and pop queen have become fast friends since finalizing their divorces and the show's crews is having a blast teasing Gwen about her crush.

"Blake and Gwen flirt like crazy! They had a great rapport right away, but it didn't really cross over into flirting until they both split from their spouses," a show insider told HollywoodLife.com. "Now, it's full throttle. They have all these inside jokes and we tease Gwen because she laughs waaay too hard at Blake's jokes. She has this little giggle that she does and it's so cute. Blake loves to come up behind her, cover her eyes with his hands and do an Adam Levine impression or something. It just cracks her up."