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I always thought it looked like Vanessa, but now it's confirmed! -- That's Nick Lachey's girly in these X17 Xclusive pix with Lindsay Lohan! Just what in the world were these two party girls doing that night on June 15 last year? Check out Wireimage's photos from earlier in the evening when the pair were out on the town with pal Sean Lennon. Who knew Vanessa was such a wild one?!

Click here to see the rest of the pix!