Why Billie Piper?

... Moyles asked listeners to download the song to see if he could influence the new charts.
Rules changed at the start of January to mean all downloads count towards the chart - no matter when they were released or whether a CD single version is out...

OK, I get the point! But why Billie Piper? I've been watching Dr Who recently and in my humble opinion, she's scarier looking than a naked Darlek.