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The two singers are also joined by Bonnie McKee, Kacey Musgraves, Tegan and Sara and Ellie Goulding to perform the lead single off upcoming 'Prism' album.
The 'I Knew You Were Trouble' singer brings out the British singer to sing 'Want U Back' before performing 'Brave' with the former judge of 'The Sing-Off'.
Nerdy Sara is daydreaming about being sassy and cool upon entering a grocery store, but she ends up being ushered out by a security.
Footage of Vanessa Carlton, Ryan Tedder, Pharrell Williams, Keenan Cahill and some other stars singing to 'Uncharted' is put together into one music video.
Although written while she was in 'full-scale panic-attack mode,' 'Kaleidoscope Heart' turns to be a success, marking the first time Sara Bareilles sits at the first place on Billboard Hot 200.
Meanwhile, Eminem's 'Recovery' is close to be the best selling album of 2010 with the latest sale number.
It's now her turn to be happy and Sara Bareilles celebrates it in every place she visits, from a restaurant to a garden.