Britney Spears' team has almost locked an enormously lucrative deal which will make her a fortune in return for appearing in Las Vegas ...

I've always been a big fan of Britney since she did the high school music video with the pig tales! 

Britney is seriously considering picking up stakes and making her residency Las Vegas.  She's been negotiating with one of the Caesar group properties to appear in a Celine Dion-type show.

Sources connected to the negotiations tell us ... from Brit's standpoint, "The deal is a go. There are several stipulations that could throw a monkey wrench in the deal, but it's basically done."

One of the outstanding issues -- exactly what Britney will be doing.  There's back-and-forth over whether she will just perform on stage at a big theater multiple nights a week, or whether she will also make appearances at functions in the hotels, nightclubs and pool day clubs.

Our sources say the money being negotiated is "astronomical" -- more than Celine's $100 mil a year.

Hook me up Brit! 

Kid Jay