This week on NBC's "The Voice" the top 10 contestants were mentored by the judges' mentors.

Shakira brought in her producer Busbee, and Blake Shelton also brought in his producer Scott Hendricks. Musical director and producer Natural was Usher's choice mentor, and Adam Levine called on his own mentor, Crosby, Stills and Nash's Graham Nash.

Before the contestants' performances, the show kicked off with a performance by the U.K. band, Rixton who sang their current hit, "Me and My Broken Heart." Following their performance, the band received a standing ovation from judges Usher and Blake Shelton.

The show started off smooth, but then things got a little crazy. What may have started off as a joke ended in Shelton going through with his threat to tweet fellow judge Adam Levine's actual number.

"I should do it right?" Shelton tweeted. "Who wants @adamlevine's personal cell number??"

"The Voice" host Carson Daly acknowledged the tweet from the Sprint Skybox commenting, "He would never do that, right? That's crossing a line."

Sure enough, Shelton "crossed the line."

"Let me just check here," Shelton said, holding up his phone. "Yes, I just did. ... I just tweeted his phone number!"

Shelton's Twitter message read, "HEY EVERYONE!!! Here it is: (310) 493-7939 <-- @adamlevine's CELL NUMBER! Think I'm kidding? Try calling it!! .... "

Soon after Shelton's twitter post, Levine's phone began ringing off the hook, and he did seem too pleased adding that he planned to seek revenge on Shelton.

Despite the TMI tweet, the show ensued with top performances by Team Adam's Christina Grimmie, Team Shakira's Kristen Merlin and Team Blake's Blake's Sisaundra Lewis.

Grimmie opted for a stunning solo piano performance of rapper Drake's "Hold On We're Going Home" while Merlin sang Passenger's "Let Her Go." Sisaundra Lewis closed out the show her captivating performance of Journey's "Oh, Sherrie."

Check out dazzling performances below. Who was your favorite of the night?