by "the top keyword in search engine" i assume you mean the most search keyword term.
this is based on "search engine consumer demand", so to speak.

...which has no relation to ranking or serp position.

What i mean was , that she was very popular and could generate loads of traffic .

there was a time when people just used to put britney spears in meta tags and hope for good rankings (those days are gone )

but now im studying the algorithm a bit more and looing for what causes good rankings and it seems that links count more than keyword density and the actual page rank in the pr(incoming link) / out going links means very little .

its more the iterative value of the links coming in in my opinion.

Regards

Malcolm