John Mayer Hooking Up With Jennifer Aniston, Jessica Simpson AND Kristin Cavallari?

John Mayer has been a busy boy if you believe the multiple tabloid tales of his alleged sex-ploits involving Jennifer Aniston, Jessica Simpson, and Hills star Kristin Cavallari.

Yesterday, we told you about the singer's reported playboy mission to New York to bed ex Jennifer Aniston.

Now In Touch is claiming Jessica Simpson has sought comfort from her old flame following her split from boyfriend Tony Romo in July.

"They’ve always had an amazing connection,” a 'business associate' of Jessica’s tells the magazine.

Meanwhile, janetcharltonshollywood.com alleges that John has been secretly hooking up with Kristin Cavallari "at a mutual friends house in the Mt Olympus area of the Hollywood Hills for the past two years!"

The blogger adds that their "'friends with benefits' relationship has evolved, and they are actually considering going public."

Jen and John in pictures