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Blue belles hit the Oscar red carpet

The red carpet was supposed to go green for the 82nd annual Academy Awards last night, but instead it was all about “Avatar” blue.

Mo’Nique celebrated her Oscar moment in the omnipotent hue, wearing a jolt of cobalt with a Billie Holiday up-do. Maggie Gyllenhaal also stayed within the blue story line. She successfully pulled off a print by Dries van Noten — not an easy feat in the gown stakes.

But the starring role in blue was occupied by Nicole Richie, who wore a stunner of a beaded gown with bell sleeves that fit her like a glove.

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Zoe Saldana, the star of “Avatar,” strayed unfortunately from the Na’vi look.

She selected a split-decision dress. It was elegant enough — pink, sparkly, strapless on top. But the skirt looked like her feet were dragging an assortment of purple plushy toys.

Anna Kendrick, the young star of “Up in the Air,” went classic retro glamour in a blush-pink, off-the-shoulder goddess gown.

Gorgeous was Demi Moore, looking nearly naked in a salmon-pink corset finishing in a cascade of ruffles.

Another pink lady, Charlize Theron, who made fashion history a couple of years ago in a garbage-bag-green creation, this year opted for a strapless dress with two giant rosettes on the chest.

As for the less successful sartorial adventures, there were a few.

Sarah Jessica Parker, who loves to push the envelope, chose a Chanel Haute Couture gown with a strange silver sculpture in ribbon on the front that looked like a nightie.

Lovely Vera Fermiga looked fan-tastic — not in a good way — in a swirly, pleated number in lipstick red by Marchesa that screamed lampshade.

Since Sandra Bullock is reportedly one of the most influential stars in her red-carpet choices, she might have chosen more carefully. The “Blind Side” star took more of a risk in a gold, panne, velvet dress with silver-leaf detail on the bodice that sadly resembled a skating costume — or a Christmas decoration.

The event was supposed to be dedicated to going green, with celebs arriving in electric cars, using eco-friendly hairstyling products and even one — Suzi Amos, the wife of “Avatar” director James Cameron — sporting a “cruelty free” silk dress in blue, natch.

serena.french@nypost.com