Best and worst dressed at Cannes Film Festival 2015
WORST: Actress Charlotte Vandermeersch looked mismatched and frumpy in ill-fitting blue pants and a sheer black top.
(Photo by Antonio de Moraes Barros Filho/FilmMagic,)
WORST: TV personality Vincent McDoom was a hot mess in a tattered white minidress that looked like a bundle of toilet paper.
(Photo by Antonio de Moraes Barros Filho/FilmMagic,)
BEST: Chanel Iman looked breathtaking in a plunging nude chiffon gown with white embellishments and a gorgeous silhouette.
(Photo by Marc Piasecki/GC Images,)
WORST: Was model Izabel Goulet's minidress from the children's section?
(Photo by Danny Martindale/GC Images)
WORST: It's pretty difficult for Natalie Portman to disappoint us -- and don't get us wrong, she looks gorgeous here -- but this Rodarte frock, with it's sheer paneling and gauzy strips is a little too cheeky for the daytime photo call. (Photo by Samir Hussein/WireImage)
BEST: Cate Blanchett was all smiles in her sophisticated black gown with a plunging nekline, blouson sleeves and a fun belted bow.
(Photo credit should read BERTRAND LANGLOIS/AFP/Getty Images)
WORST: Natalia Shustova looked like a big cupcake, or teacup, in this loud floral ballgown with a massive bow.
(Photo by Clemens Bilan/Getty Images for Kering)
BEST: Adriana Lima was sleek and chic in a sexy black velvet number with red lips, glam hair and a diamon bangle.
(Photo by Venturelli/WireImage)
BEST: Actress Uma Thurman achieved Cannes fashion perfection as she exited a yacht in a gorgeous green gown with a plunging neckline. (Photo by Marc Piasecki/GC Images,)
BEST: Diane Kruger definitely showed off her best assets in this sheer and sparkly gown. The low-draped side shows off just enough skin without being too revealing and the super sheer side panels achieved the same effect. (Photo by Tony Barson/FilmMagic)
BEST: Jane Fonda, 77, continued to prove that age ain't nothing but a number as she ruled the red carpet in a striking blue gown with decorative slits. She tipped off her look with a set of chandelier earrings. (Photo by Mike Marsland/WireImage)
WORST: Model Lindsay Ellingson doesn't typically strike out in the fashion department, but this futuristic gown with sheer panels feels way too 90s. (Photo by Antonio de Moraes Barros Filho/FilmMagic,)
BEST: All we have to say is, "Wow!" Eva Longoria looked every inch the glamazon in this midnight blue gown with textured folds along the skirt. (Photo by Kristina Nikishina/Epsilon/Getty Images)
BEST: We were instantly taken in by Cate Blanchett's watercolor-esque gown. The billowing fabric and empire waist just scream glam. (Photo by Gisela Schober/Getty Images)
BEST: Big points go to Salma Hayek for keeping it simple at the Cannes red carpet in this form-fitting frock, but amping up the look with a pop of color. (Photo by Antonio de Moraes Barros Filho/FilmMagic,)
WORST: Maybe our moms are rubbing off on us, but we can't stand a wrinkle on the red carpet. Something about the draping on Bar Rafaeli's white gown feels off to us, like a dining room napkin -- and the messy pony isn't doing her any favors.
(Photo by Pascal Le Segretain/Getty Images)
BEST: Sienna Miller stepped up her game for the more formal part of the evening and absolutely stunned in a navy, one-shoulder gown. The pop of color on her lips sealed off the amazing look. (Photo by Venturelli/WireImage)
WORST: Jane Seymour literally hasn't aged a day, but her form-fitting frock with a mullet-style skirt left little to be desired. We feel like the dress was a little more prom than Cannes. (Photo by Pascal Le Segretain/Getty Images)
WORST: We typically don't mind a feathered skirt, but something about the beaded bodice makes the whole gown look thick like molasses. Not the worst look, but definitely not Naomi Watts' best.
WORST: Viann Zhang definitely caught every photographer's eye. The Chinese actress turned heads in an elaborate gown with an Elizabethan-style collar and an enormous train. We'll give her points for originality, but the look wasn't one of our favorites. (Photo by George Pimentel/WireImage)
BEST: Charlize Theron wowed in a yellow gown with a dramatic train. Glam curls waves and simple accessories completed the South African beauty's gorgeous look.
(Photo by George Pimentel/WireImage)
WORST: Russian actress Elena Lenina looked foolish -- and straight out of the "Hunger Games" capital in this wild gown with wings -- not to mention that Marge Simpson-inspired updo.
(Photo by Traverso/L'Oreal/Getty Images)
WORST: Woody Allen was flanked by his leading ladies Emma Stone and Parker Posey. While Stone's look was youthful and chic, Posey's look was a bit eccentric. (Photo by Andreas Rentz/Getty Images)
BEST: Emma Stone looked every inch the glamazon in a white dress with a striking, long train at the premiere of "Irrational Man." (Photo by Pascal Le Segretain/Getty Images)
BEST: Rachel Weisz definitely knows the value of simplicity. The gorgeous gal was white-hot in an A-line gown with a cut-out shrug. (Photo by Ben A. Pruchnie/Getty Images,,)
BEST: It's literally impossible for Miranda Kerr to ever have an off-night in the fashion department. The catwalker showed off her famous figure in a pink dress with a sky-high slit and a plunging neckline. (Photo by Alex B. Huckle/GC Images,)
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It's that time of year again ... Cannes Film Festival is upon us, and we can't get enough of the fun, innovative and downright fanciful gowns.
Stars like Sienna Miller and Julianne Moore wowed us with sophisticated, glamorous looks -- but other celebs missed the mark.
Check out our picks for best and worst dressed at Cannes 2015.