She sang "Happy"
Obviously SINGING!
No she doesn't.
No she has 3 brothers.
No, she is working on a new album.
Because she enjoys singing and has a good voice.
Whether or not Leona Lewis is a good singer or not is based solely on opinion. Leona Lewis has won a few awards, and has had quite a few number one singles in various countries.
Because she enjoys it and she's good at it.
As of February 2012 there have been no announcements confirming that Leona Lewis is pregnant. Therefore it's unlikely that she is.
She has no children.
Yes she likes children.
Leona has said she enjoys singing "Homeless". She is also very found of "Happy" which she co-wrote with Ryan Tedder.
Leona Lewis's full name is Leona Louise Lewis.