LOS ANGELES (Reuters) - Britney Spears said on Tuesday she was pregnant with her first child, ending months of speculation over whether the pop princess was launching a new career as a mother. Spears, 23, who married dancer Kevin Federline last September, made the announcement in a posting to fans on her official Web site. "The time has finally come to share our wonderful news that we are expecting our first child together. There were reports that I was in the hospital this weekend. Kevin and I just want everyone to know that all is well. Thank you for your...