Okay, so Lindsay is insisting that her sleepover/all night rager at Jason Segel's house the other night was a "meeting" (if she says it on Twitter, it MUST be true), but we're hearing otherwise!

A source tells X17online exclusively that Lindsay and Jason have quietly been seeing each other for quite some time!

    "Lindsay's been going to his house for a while now and they've been having meetings at Chateau Marmont. They are 'dating' and you will probably see more of these two if you keep an eye on them."

Really? So what kind of business meetings are these? Maybe Lindsay's looking for a partner in crime for her next scandalous photo shoot? Or do you think these two are actually shacking up?