Britney Spears to Nix World Tour if Sean Preston, Jayden James Can't Come; K-Fed's Lawyers Block Arrangement

Britney Spears is prepared to cancel her upcoming Circus tour if lawyers for ex-husband Kevin Federline continue to block an agreement allowing her to take the kids on the road, according to a report on celeb news site TMZ.

For weeks, Britney, K-Fed and her father Jamie Spears have been privately hashing out a plan to let the kids travel with Britney on her world tour.

The plan is to have homes in three bases - New Jersey, New Orleans and Los Angeles. Sean Preston and Jayden James would stay in one of these three bases and mom would commute back and forth while doing concerts in each region.

Then there's this strange fact: Britney Spears is prepared to pay the FedEx man in excess of $4,000 per week for every week in which she's on tour.

The way the deal goes... Britney would get Kevin his own pad in each of the three "bases" and he wouldn't even have to show up to get the money! Why, you ask, would she pay him if he doesn't show? You can figure it out.

Is The Circus Starring Britney Spears, set to kick off March 3, in jeopardy?

Here's the deal: Britney, K-Fed and Jamie - who also got restraining orders against three shady characters from Britney's past in what's been an active week for him - worked out the arrangement without the help of any lawyers.

A week ago, however, attorneys for Kevin Federline became aware of the plan and were furious, thinking that Jamie Spears went behind their backs.

Now K-Fed's lawyers say they object to the plan but won't specifically say why, and Kevin apparently doesn't have the cojones to stand up to them.

Britney Spears - who now has close to a 50-50 custody arrangement in place and a long-term agreement worked out with K-Fed which would extend said arrangement - WILL cancel the tour if she can't take her kids. Stay tuned ...