Fire Scare at Prince's Tonight Show Taping
TMZ has the story: Jay had just finished his monologue when security came in and cleared the joint. A fire alarm had gone off just before people were ordered to leave. Prince is scheduled to perform.
UPDATE: It's all good. According to someone inside, everyone went right back in after the evac -- and Jay told everyone that "Access Hollywood" was taping something next door involving smoke, and didn't tell the fire folks. - more on this story