Christina Aguilera reunited with son Max ahead of her first Christmas as a single mum

By DAILY MAIL REPORTER Back together: After her whistlestop tour to promote Burlesque, Christina Aguilera and son Max enjoy some last minute Christmas shopping at Barneys New York in Beverly HillsFor parents with young children, Christmas can be a magical time, with trips to visit Santa, school nativity plays and carol concerts.But it looks like Christina Aguilera is not quite feeling the holid...