Showbiz
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The 38-year-old Australian, who married Crown Prince Frederik of Denmark in 2004, already has 4-year-old son Prince Christian and 3-year-old daughter Princess Isabella with her husband, who is first in line to the Danish throne.
A spokesperson for the royal family wrote on their website: "Their royal highnesses the Crown Prince and Crown Princess are happy to announce that the Crown Princess is expecting twins.
"The births are expected to happen at the Rigshospital [in Copenhagen] some time during January 2011.''
More: Princess Mary, Showbiz
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