Ke$ha to end Bruno's reign?

Ke$ha's emerging as the favourite to be No 1 on the Vodafone Freebees Big Top 40 this weekend. Here's your chance to see the contenders.

Bruno Mars has enjoyed three months at number 1 with "Grenade" but will his reign come to an end on Sunday.

Last week Ke$ha was the highest new entry at number 3 with her brand new song "We R Who We R". Can she climb to the top of the chart. Diddy was also a new entry on last weekโ€™s show.  How will "Coming Home" do seven days on.

There are a couple of huge songs released this Sunday that could beat them all to the number 1 spot. Taio Cruz releases two new mixes of "Higher", one features Travie McCoy the other is with Kylie.  So from Sunday fans can choose to download any of 3 versions of the song. Which will end up highest?

It's also worth keeping an eye on BRIT Critics Choice winner Jessie J. She's already got 'Do It Like a Dude'  in the top 10, but not content with that, sheโ€™s rushing out the follow up this week due to huge demand. "Price Tag" is a bit more chilled and features B.o.B.

Enrique's new track "Tonight I'm Loving You" has already been a massive hit all around the world.  How will it do here?  

And finally, Yasmin releases her debut single.  She's already been on the chart once, featuring on Devlinโ€™s hit Runaway last year.  Now sheโ€™s going along with the brilliant "On My Own".  

Join Rich and Kat on Sunday from 4pm to find out which song emerges victorious.