Cristian de la Fuente MIA

4/29/2008 8:55 PM PDT
Our spies say Cristian de la Fuente is a no-show one hour before "Dancing" airs. He's still in the hospital, waiting on MRI results.

We're told his partner, Cheryl Burke, is in the studio now, sans partner. And Def Leppard is taping a segment for the live show. They didn't get it right the first time so the band is re-taping. BTdubs, they're lip syncing ... poorly.