Gwen Stefani
"Used to Love You" singer Gwen Stefani, pictured Oct. 24, 2015, flirted with fellow "Voice" coach, Blake Shelton on "The Tonight Show" Tuesday. Getty Images

Blake Shelton and Gwen Stefani, two of the coaches on NBC's "The Voice," claim they are not dating, but the two continue to flirt with each other on television. The singers did a duet of Drake’s “Hotline Bling” for Jimmy Fallon’s “Spin the Microphone” game on “The Tonight Show” Tuesday night -- and Stefani might have hinted at their rumored romance at the end.

The singers, who both announced their divorces from their partners over the summer, playfully poked fun at each other while playing Fallon’s game. Stefani teased Shelton when he had to perform “YMCA” and Shelton said she wanted Stefani to get an embarrassing song.

Finally, they both agreed to do “Hotline Bling.” At the end of the song, she added in the word “cowboy.” She might have said "ever since I left the city cowboy?” but Fish Wrapper wondered if she said, "ever since I slept with a cowboy?" To find out what she did or did not say, check out the clip below:

Stefani, 45, announced her split from her husband of 13 years, Bush singer Gavin Rossdale, in August. "While the two of us have come to the mutual decision that we will no longer be partners in marriage, we remain partners in parenthood and are committed to jointly raising our three sons in a happy and healthy environment,” they announced in their official statement.

Their breakup came a month after Shelton and country singer Miranda Lambert revealed they were splitting after four years of marriage. "This is not the future we envisioned. And it is with heavy hearts that we move forward separately,” they said. “We are real people, with real lives, with real families, friends and colleagues. Therefore, we kindly ask for privacy and compassion concerning this very personal matter."

Even though they deny it publicly, Shelton and Stefani have reportedly connected. The country star loves to talk to the "Used to Love You” singer about everything, except his divorce. “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,” a source told Hollywood Life Monday, adding: “It’s more important for him that everyone is in a good mood. No drama!”

Follow me on Twitter @mariamzzarella