Angelina Jolie and Brad Pitt have no intention of stopping at six kids, it's claimed.

Angelina – who recently added to their 'rainbow family' with biological twins Know Leon and Vivienne Marcheline – is said to already be making plans for another child.

Jolie plans on having “one more baby naturally - even if they end up having twins. (Twins) would be wonderful,” a source tells MSNBC.

“A dozen kids would be their dream,” adds the insider.

Hollywood-based clinical psychologist Dr. Michelle Golland - who doesn’t treat Jolie - believes that such a large family wouldn't be most women's dream.

“There is not one mother that I know that would trade places with Angelina Jolie even if it meant they got to sleep with Brad Pitt,” she says.