Girl band songs for our band?

Okay, so I now need a little bit of help deciding which song to sing

Here are our voices:

Lucy Kane : (Watch from at least 2 mins 30 seconds on wards if you
watch it) http://www.youtube.com/watch?v=WM5tikVdkFA

Sophie Kingsley (Me.) : (Watch from at least 1 min 20 seconds on wards
if you watch it.) http://www.youtube.com/watch?v=9PH3nS7BOjs

Couldn't find one for the last girl :( But she's amazin'!! :))

We had to put a song together - the three of us - for a project we
were doing in our school this year (Just us and some other yr 8s and
9s in our group - we're yr 9.) and that's how this came about. We sang
'Too Lost In You' by the 'Sugababes' SO! Any ideas??

(Just in case you wanted to know - all three of us are 14, I'm the
youngest as I was born in May of the year after they were - 1997. So I
just turned 14 last month and they were both born in September and
November of the year before - 1996.)

P.S. : PLEASE don't put stupid ones up (If you're trying to be
stupid.) It's really annoying...