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Angelina Jolie and Brad Pitt are reportedly hoping to increase their brood to eight in 2009.
The couple – who welcomed twins Knox and Vivienne in July - are said to be undergoing fertility treatment in a bid to conceive a second set of twins.
A source says, "Angelina's doctors told her she has a strong chance of conceiving twins if she does it within two years after having her first pair.
“She has been seeing a fertility doctor regularly. She and Brad are monitoring when she is fertile. And they are trying really hard in the bedroom!"
Meanwhile, the Jolie-Pitts are set to spend Christmas in Ethiopa, it's claimed.
The family will fly out to the African country's capital, Addis Ababa - the birthplace of their adoptive daughter Zahara - according to the Sunday Mirror.
See the globe-trotting family below
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