Crazy in shape! Beyoncé showcases her curvy post-baby body... a month after giving birth

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By Nadia Mendoza

Effortless: Beyoncé shows off post-pregnancy body in New York last night, exactly one month after giving birth

Hiding a post-pregnancy body beneath your husband's clothes is not an option for celebrity mothers.

And Beyoncé has surrendered the comfort of Jay-Z's baggy T-shirts for a simply striking red dress to showcase her enviable figure without a hint of an unwanted lump or bump.

The Crazy In Love star, who gave birth to the couple's first child Blue Ivy Carter exactly a month ago on January 7, embraced her voluptuous silhouette and smiled proudly as she paraded her curves.

Beyoncé made her first public appearance last night to celebrate Jay-Z's two anticipated shows at Carnegie Hall to benefit United Way of New York City and The Shawn Carter Scholarship Foundation.

The mother-of-one opted for an elegant Alice Temperley cocktail dress, teamed with Ofira & Lorraine Schwartz jewels, a quirky Alexander McQueen clutch bag and a pair of sparkly Christian Louboutin heels.

Swagger: New mother showed off her post-baby curves exactly a month after giving birth, seen right in December in New York

Her straightened hair, which was perfectly groomed and primped but without being overstyled, and hung loosely over her shoulders as a pair of large gold hoop earrings peeped through.

She walked with a confident stride and a sexy swagger, proving she hasn't lost any of her girl power since becoming a mother.

Protected: Singer was flanked by several security guards as she headed to the car after the concert

Letting her hair down: Beyonce had a night off from mummy duties as she watched Jay-Z perform

Her rap mogul husband took to the stage at Carnegie Hall in a bow tie and dinner jacket, flanked by a 36-piece orchestra.

Jay-Z, 42, couldn't resist a gushy dedication to his daughter, telling the audience: 'Put a hand in the air for Blue,' before belting out Glory, which he wrote especially for the one-month-old.

Not only did he deliver with songs Public Service Announcement, Thank You and Most Kingz, he was also joined by Alicia Keys for a rendition of their epic anthem Empire State of Mind.

Proud father: Jay-Z performed for Benefit The United Way of New York City and Shawn Carter Foundation

Best seat in the house: Jay-Z launched into song while surrounded by his fans

Suited and booted: Alicia Keys and Nas perform together in matching tuxedos

The Fallin' beauty focused on her vocals instead of her looks by slipping into an androgynous suit and scraping her hair back into a bun, adding a splash of femininity with large drop earrings.

Rapper Nas, who was once involved in a bitter feud with Jay-Z, also took to the stage with the new father to perform N.Y. State of Mind, before launching into his own hit If I Ruled the World.

The human doily: Model Jessica White opts for a bizarre lace jumpsuit, while singer Alicia arrives in a more dressed down look

Winter chic: Brooklyn Decker added a splash of colour to her LBD, while Liza Minnelli went a little Cruella de Vil

For his encore, Jay-Z ditched the suited and booted look for hip-hop attire, including a black T-shirt and gold chain, signing off with Dead Presidents and Money Ain't A Thang in the audience box.

He also told the sea of admirers he had 'a beautiful time', praising the crowd for looking 'exquisite'.

A host of famous faces showed their support, with models Jessica White and Brookyln Decker turning up, alongside the legendary Liza Minnelli in an oversized Cruella De Vil-inspired winter coat.

Gushing: Jay-Z dedicated his song Glory to new daughter Blue and told the audience they were 'exquisite'