Peace at Last On 'American Idol' Set!

No blood today on the set of "American Idol." In fact, it was downright peaceful and professional ... sources connected with the show tell TMZ.

We're told from outward appearances at least ... Mariah Carey and Nicki Minaj buried the hatchet and were civil with each other during the entire day of auditions in Charlotte, North Carolina.

Our sources say everyone was "embarrassed" by the outburst between Nicki and Mariah captured on video and posted on TMZ. They apparently took it to heart. Our spies say the confrontation "shocked everyone back into place."

We're told aside from everyone getting along, the talent was great and the judges meshed together better than just about any configuration the show has ever had.

The question ... will the detente last? Everyone is boarding a plane right now for Baton Rouge, Louisiana.