Jenson Button has revealed he and his fiancée Brittny Ward have welcomed their second child together, a baby girl.The 40 year old, who is also dad to one year old son Hendrix with his other half, took to his Instagram feed to post a series of snaps of his newborn daughter for his 1.2million followers to see. One photo sees the adorable little girl wrapped up in a blanket as she wears a pink and blue striped beanie on her head.