*NSYNC Reunion -- We're NOT Going on Tour!!

Chris Kirkpatrick is tearin' up the hearts of girls in their 20's (and 30's (and 40's (and 50's))) across the country -- after announcing on the radio this morning that last night's *NSYNC reunion won't happen EVER AGAIN!!

Chris went on the Miami radio show "Johnny's House" early Monday morning to discuss last night's not-really-a-surprise SURPRISE performance ... and dropped all the details about how the whole thing came together.

Chris says he got a call from Justin Timberlake a few weeks ago out of the blue ... who asked if he was available to perform at the VMAs. Chris' response -- a resounding HELL YES (duh).

The guys headed down to Miami to rehearse and that's where Chris says Justin dropped two bombshells: He didn't tell MTV about his top secret plans and yes, dancing would be involved.

The interviewer then asked about rumors of a possible reunion tour -- but sadly CK shot them down saying the reunion was a one time thing to support JT.

Sorry Chris. And Joey. And Lance. And you too J.C.