What are the chords on piano for Price Tag by Jessie J? (please answer 10 points!)?

So for my next youtube video, I'm having a friend sing with me and she's going to play the guitar at the same time I'm playing piano (I'm just learning). But I was wondering what are the piano chords for Price Tag by Jessie J?? And I was also thinking of singing "Pray" by- Justin Bieber, and also maybe Turning Tables by- Adele (I love this song it's such a gorgous song:) So if you could give me the piano chords for that one aswell that'd be awesome :) Thanks so much in advance :) Also for a beginner, are those songs easy to learn?? Aswell as on guitar?.. If not what would be some great begginner songs that are pop style?? No RUDE ANSWERS PLEASE :) Thanks