Previously in the "Tonight Show,' guests were 'No Doubt' hitmaker Gwen Stefani And country singer Blake Shelton. Both guests peformed 'Lip Sync', a Jimmy Fallon challenge on his "The Tonight Show."

Watch the video:

As you can see in the video, Shelton is the first one to take the challenge. He lip sync "Puttin' On The Ritz" by Taco. Next is the host Jimmy Fallon, lip syncing "Burn" by Ellie Goulding, and followed by "No Doubt" vox Gwen Stefani performing a lip sync of "Call Me Maybe" by Carly Rae Jepsen.

On the next round, country singer performs "Nothing Gonna Stop Us Now" by 80's band "Starship", while "No Doubt" singer lip sync "Endless Love" by Diana Ross and Lionel Richie. There's a twist on this last song performed by Gwen Stefani as Shelton suddenly appears and lip sync the part of Diana Ross line.

Fallon's final song is "Cocktails For Two" by Spike Jones.

On related news, "The Voice" season 7 new judge Gwen Stefani reportedly had fought with her husband Gavin Rossdale during work for the NBC reality TV show, according to US Magazine.

According to the publication, Gwen told them

"The whole thing was a surprise," she said.

The singer also told the publication "I just had my baby [Apollo], and I got the call. I had no idea sitting here would be so fun. I was really a bit anxious after I signed it and was like, 'Oh my god, what have I gotten myself into?'"