'We're so happy and very excited!' Victoria Beckham tweets after announcing she is expecting fourth child

By SARAH BULL, LIZ THOMAS and BEN TODD Happy news: David and Victoria kept their heads down as they arrived back at their Hertfordshire mansion last night after announcing they are expecting their fourth childShe's never made a secret of her desire to have another baby, so it's no wonder Victoria Beckham is struggling to contain her excitement about welcoming a fourth child into her family.The...