Sir Paul McCartney's daughter STELLA is expecting her third child, according to media reports. The fashion designer already has two children, Miller Alasdhair James Willis and Bailey Linda Olwyn Willis with husband Alasdhair Willis - and the pair will have a third child by the end of the year, reports British newspaper the Daily Mirror. A source tells the paper, "Paul loves having family around him. It's been what has been getting him through the tough times. He would be overjoyed by a new addition."