Lady Gaga stuns in plunging black gown with thigh-high slit at National Board ...

Lady Gaga celebrated A Star Is Born win for Best Actress on Tuesday at the National Board of Review Awards in New York City. 

Bradley Cooper, the director and star of the remake, and lead actress Lady Gaga, 32, attended the awards gala at Cipriani 42nd Street after being snubbed at the Golden Globe Awards.

The songstress oozed old-school Hollywood glamour in a floor-length sleeveless black gown with plunging neckline and high thigh slit and celebrated Bradley, 44, winning Best Director for the film.

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Hollywood starlet: Lady Gaga celebrated A Star Is Born win for Best Actress on Tuesday at the National Board of Review Awards in New York City 

Hollywood starlet: Lady Gaga celebrated A Star Is Born win for Best Actress on Tuesday at the National Board of Review Awards in New York City 

The Born This Way singer completed her outfit with black heels and accessorized by carrying black and gold feathers.

Lady Gaga, born Stefani Joanne Angelina Germanotta, was back to blonde after sporting blue hair on Sunday for the Golden Globe Awards in Beverly Hills, California.

She was nominated for the Golden Globe Award for Best Actress in a Drama but the award went to Glenn Close, 71, for her work in The Wife.

Turning heads: The songstress oozed old-school Hollywood glamour in a floor-length sleeveless black gown with plunging neckline and high thigh slit

Turning heads: The songstress oozed old-school Hollywood glamour in a floor-length sleeveless black gown with plunging neckline and high thigh slit

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Strike a pose: The songstress showcased plenty of leg as she hit the red carpet 

Strike a pose: The songstress showcased plenty of leg as she hit the red carpet 

Hollywood glamour: The New York City native oozed old-school Hollywood glamour

Black gown: The Born This Way singer wore a long black gown with plunging neckline

Hollywood glamour: The New York City native oozed old-school Hollywood glamour 

Blonde beauty: The singer-actress was back to blonde after sporting blue hair on Sunday at the Golden Globe Awards in Beverly Hills, California

Blonde beauty: The singer-actress was back to blonde after sporting blue hair on Sunday at the Golden Globe Awards in Beverly Hills, California

Top honor: Lady Gaga won Best Actress for her portrayal of Ally Campana in the remake

Critical acclaim: The actress has received critical acclaim for her work in A Star Is Born

Top honor: Lady Gaga won Best Actress for her portrayal of Ally Campana in the remake

Photo call: The actress was the center of attention on the carpet

Photo call: The actress was the center of attention on the carpet

Best director: Bradley Cooper attended the National Board of Review Awards on Tuesday in New York City after winning for Best Director for A Star Is Born

Best director: Bradley Cooper attended the National Board of Review Awards on Tuesday in New York City after winning for Best Director for A Star Is Born

Recognition: Gaga looked overwhelmed as she received the Best Actress award with Bradley standing up to congratulate her 

Recognition: Gaga looked overwhelmed as she received the Best Actress award with Bradley standing up to congratulate her 

Special moment: The pair shared a tender hug before she headed to the stage to make her speech 

Special moment: The pair shared a tender hug before she headed to the stage to make her speech 

Over the moon: Gaga pointed to Bradley in the audience as she accepted her award 

Over the moon: Gaga pointed to Bradley in the audience as she accepted her award 

Her big moment: The Born This Way hitmaker handed Stephen Colbert her giant feather boa ahead of making her acceptance speech 

Her big moment: The Born This Way hitmaker handed Stephen Colbert her giant feather boa ahead of making her acceptance speech 

Gentlemanly: Stephen showed off his chivalrous side as he assisted Gaga off stage 

Gentlemanly: Stephen showed off his chivalrous side as he assisted Gaga off stage 

The New York City native celebrated her acting win at the National Board of Review gala with her mother Cynthia Germanotta.

The blondes sat next to each other at a table and held hands during the event.

The Poker Face singer also was spotted during the gala with Bradley and legendary Hollywood director Steven Spielberg, 72.

The Jaws director gave Lady Gaga a congratulatory hug as Bradley looked on.

Family affair: Lady Gaga celebrated her win with her mother Cynthia Germanotta

Family affair: Lady Gaga celebrated her win with her mother Cynthia Germanotta

Having fun: The blondes were having fun at the awards gala at Cipriani 42nd Street

Having fun: The blondes were having fun at the awards gala at Cipriani 42nd Street

Hollywood legend: Steven Spielberg met up with Bradley and Lady Gaga

Hollywood legend: Steven Spielberg met up with Bradley and Lady Gaga

Big hug: The legendary Hollywood director gave Lady Gaga a hug

Big hug: The legendary Hollywood director gave Lady Gaga a hug

Bradley looked typically dapper at the National Board of Review gala in a grey suit, white dress shirt and blue tie.

He won for Best Director after losing in the same category to Roma director Alfonso Cuarón, 57, at the Golden Globes.

Sam Elliott, 74, also won the National Board of Review Award for Best Supporting Actor for his work in A Star Is Born.

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