Oh helllllll no! Ben Affleck's on-again girlfriend Lindsay Shookus is NOT gonna sleep on the leftover bed linens of Miss Shauna Sexton, Ben's Playboy model ex-girlfriend -- his pre-rehab fling.

Lindsay recently flew in from New York to visit her man, with whom she recently reunited, and she's staying in his $16M Pacific Palisades home -- which you'd THINK would be outfitted with 800-thread count Frette, but no. Apparently Lindsay saw fit to replace whatever Ben currently has with Bed, Bath & Beyond's finest Ugg pillows and sheets (we love that Shookus showed her digital BB&B rewards bar code on her phone in order to get a discount!). The only reason we can think of is that she wanted to freshen up Ben's bed after all of his pre-rehab antics. We don't blame her!

The couple started with dinner out at Kreation Organic in Santa Monica, before Ben lit a cig, smoked it like a boss, and sped away in his gangsta Caddy. Smokin'!