Showbiz
Rex Features
The actors, who are known to be protective about their personal lives, did not release any further information on the news, reports the BBC.
Duff recently spoke about her desire to become a mother, saying: "I would love to have a baby. I'm not putting it off but unfortunately bodies don't work that way."
McAvoy and Duff met on the set of Channel 4 comedy-drama Shameless in 2003. They wed in a low-key ceremony three years later.
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