K-Fed asks for legal custody of kids and spousal support...can you say LOSER?

Kevin Federline has responded to his estranged wife's divorce petition.

Federline is asking for legal and physical custody of the couple's children. Sources tell TMZ that Federline will fight Spears on the custody issue. In the response, obtained by TMZ, Federline is asking the judge to award Spears visitation.

Federline is also asking the court to award him spousal support.

tmz