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WFT! So here's the deal ... Brit stopped by the Virgin Megastore on Sunset (as she's seen here), went to Malibu, picked up her favorite pap Adnan, then cruised back to her house in Bel Air.

All the while, Brit was behind the wheel -- racing at about 100 mph!, according to our photogs -- trying to hide from the rest of the pack that Mr. Adnan Ghalib was ducked down in the seat of her car!!!

We're still getting details from our shooters and we'll bring you the full story a little later, with Xclusive video!!!

more pix inside ...