London, Dec 12 : Madonna and Guy Ritchie are still locked in a bitter custody battle of their kids.

The couple, who divorced last month, have still to settle an agreement over where the children should live.

“Both sets of lawyers have still got their heads down. It is very complicated,” the Daily Star quoted a source as saying.

The couple has three kids, two sons, and a daughter.

Madonna is apparently determined to move back to the States, where the father of her eldest child Lourdes lives in New York.

They have one biological child Rocco, eight, whom Ritchie is said to dote upon.

They adopted another son, David, three, from Malawi.

Another source said Ritchie may insist on Madonna buying him an apartment in New York as part of any deal allowing the children to live in the city.

She cannot take them there permanently unless Ritchie or an English court gives permission. (ANI)