Jessie J has shot to the top of the iTunes singles chart with her second single, 'Price Tag', which features U.S rapper B.o.B. 

The Essex-born singer-songwriter's new track was only released this week but has already shifted enough copies on iTunes to make it to number 1. The official midweek singles chart update is due later this afternoon (February 2) and she's expected to make a significant impact there, too. 

The vocal star tweeted about the exciting news last night when 'Price Tag' first hit the top spot:

"I'm #1 on I TUNES *speechless* #heartbeats I'm actually just in shock.... Let's keep it there!!! Omg... Thank you thank you thank you <3 UK stand up!!!"

Watch the video for her second offering here: