Kate Winslet's publicist says the Oscar-winning British actress has given birth to her third child, a son, in Sussex, England. "Mother and baby are doing great," her representative told People.com Tuesday. Winslet's first child with husband Ned Rocknroll, whom she married last December, was born Saturday. The baby's name has not been announced to the media. The 38-year-old star of "Sense and Sensibility," "Titanic" and "The Reader" also has a son and daughter from her two previous marriages. She will soon be seen in the film "Labor Day."