Federline vows to stay quiet about Spears

Britney Spears' ex-husband Kevin Federline is refusing to berate his former wife in public, insisting any issues he has to discuss with her will be done behind closed doors.

Spears' mothering skills of the couple's two children Sean Preston, 22 months; and Jayden James, 10 months, have been criticised in the media over the past year and the pop star's recent behaviour on video and photo shoots have raised questions about her emotional state.