The 43-year-old model said a lot of troublesome thoughts crosses one's mind while walking the ramp, reported E!Online.
"I'm nervous before I step on any runway, no matter how long I've been doing this career. A shoe could break, your dress could fall down...You could slip. Anything could happen!," Campbell said.
She feels that her fellow supermodels Tyra Banks and Heidi Klum are doing great by taking up acting projects.