Nikki Blonsky

She and Ricki Lake both made cameos at Pinky's store.

I was sad. Niki is by far the best Tracy.

Yeah I wonder why not since the other Traceys were there. I think Nikki is the best one.

I also agree with many on this thread that Nikki is, in my opinion, the best. She embodied the character and became Tracy Turnblad. When I watch the movie, which I still do often, I see Tracy, not Nikki playing Tracy. And then, it's weird to see Nikki as herself on the extra features.

But in answer to the question, it seems that no one from the movie cast made any cameo. I was hoping and would have loved to see Nikki at some point.