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 week’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, she’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 Devlin’s hit Runaway last year.  Now she’s going along with the brilliant "On My Own".  

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