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Star is reporting that Britney has been dialing her ex for "weekly steamy phone sex sessions" late at night!

Oh pulllleeaaase!

Apparently it all started one sleepless night for Brit - when she dialed up K-Fed's house and the former Mr. and Mrs. Federline started chatting about the boys...however, the conversation soon switched from G Rated to X Rated, with Kevin supplying the dirty talk that he knew would lull Brit to sleep(?)!

Talk about a bedtime story!

An "insider" tells the mag that the pair's been engaging in phone sex ever since - "at least once a week. The one thing those two have in common is their need for sex, and after they get going, there are no holds barred."

Hmmm...I dunno about you, but this story seems all wet to me!