Alimony and Gross Income

When computing Monthly Gross Income, on line 1, of the Child Support Obligation, worksheet A, is alimony considered part of this income? The goverment obviously considers this income for my ex, so I would assume it should be factored in? Also, if this is the case, is it still considered part of my gross income, for purposes of calculation?

Thanks,

Not if the child support being calculated is for a child of the marriage for which the alimony is paid.