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Guess Who From Behind

Jacopo Raule/FilmMagic

Looks like this starlet could do with some low-rise undies.

The actress' drooping waistline revealed some purple lace lingerie when she was snapped heading home from the South of France.

But it's not just the inappropriate granny panties that have us chuckling. Wait until you see the wacky style statement she's making from the front!

Can you guess the tacky traveler? 

Mischa Barton










It's Mischa Barton!

Frankly, the peek-a-boo panties can't even compete with the former O.C. star's big plastic specs for shock value.

Her unfashionable farewell is such a shame, too, because Mischa had cleaned up so nicely for Cannes.  

We're not expecting haute couture in flight, but almost anything would have been an upgrade from this outfit.

PHOTOS: Fashion Police