Washington, July 26 (ANI): The Britney Spears-Kevin Federline divorce battle just might turn into a nasty fight, they are no longer on speaking terms.

As for how the cold war between the two started, well it seems that it all began when K-Fed and Britney's mum Lynn banded together and "strong-armed" her into rehab.

Bitter over that fact, Britney wouldn't even speak to Federline once she got out of the Promises clinic in Malibu.

However, with a custody battle likely especially given the fact that Britney is reaching breaking point once again, the singer is eager to get in touch with her estranged hubby, reports TMZ.

The only problem is that now he is the one who won't talk to her.

All this is apparently making Britney a bit nervous, for not only are there little things involving their sons like the nannies and which Sunday school the kids will attend, there also looms the greater issue of which parent will get physical custody.

Britney and K-Fed currently have joint-custody of Sean Preston and Jayden James, but sources reveal that that's not an arrangement the singer is happy with, and that she wants full custody. (ANI)