So remember the other day when old Cindy Adams' copy of Star magazine arrived at her Yorkie-filled apartment a day early, enabling her to get that amazing "scoop" on Shar Jackson's pregnancy?

Well, turns out Cindy would have been better off using that magazine to pick up after her yappy little dogs instead. Because now, in addition to denying the whole thing, Jackson has already lawyered up, presumably with the intent of slapping Star with a fairly lucrative lawsuit.

TMZ has learned Shar Jackson has hired attorney George Gallegos in her fight against Star Magazine's claims that she is pregnant once again with ex Kevin Federline's baby. Popozao!

Shar, who denies the mag's claim, says her children are being affected by the rumors, and told TMZ through her rep, "When my kids hear things at school and then ask me if they are getting a new brother or sister, I have to put my foot down."

But wait! There's more!

TMZ has also learned that Shar is willing to prove to the magazine that she is not pregnant, and tells Star's editor-in-chief, Bonnie Fuller, "I stand by my truth by offering you an EPT test if you stand by yours and reveal your 'source' to me."

And while Shar doesn't deny that she and K-Fed have started dating again (which, for the record, is embarrassing enough) it seems pretty clear that Star kinda missed the boat on the whole pregnancy thing.

But hey, you can't blame Bonnie for trying, right?

Meanwhile, Jackson is actively trying to console her other children, who are still looking for a "cool comeback" to schoolyard taunts of, "Oh yeah? Well, yo' mama is so dumb, she's having unprotected sex with Kevin Federline!"