By Joyce Eng,
The British singer is due in December and is "over the moon," a source told the paper. Allen, 27, and her husband Sam Cooper, 34, are already parents to 8-month-old daughter Ethel.
Allen's rep declined to comment.
Allen and Cooper have been married for a year. Allen had previously suffered two miscarriages, first in 2008 at four months during her relationship with musician Ed Simons and again in November 2010 at six months while carrying Cooper's baby boy.
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