Broken Strings James Morrison & Nelly Furtado Download 'Broken Strings' on iTunes
The popstar has joined Twitter under the name TheRealXtina.
For her first tweet Christina said: "Here goes my first Tweet! Brace yourselves… So excited to connect with all my fans here. xo - Xtina"
She later added: "Thanks for the welcome to Twitter. I'm getting the hang of this. Never thought I'd say the word 'hashtag'. Pandora's box has been opened."