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Michelle Obama, President Barack Obama

Ron Sachs-Pool/Getty Images

Michelle Obama debuted another gorgeous look at a White House State Dinner honoring Chinese President Xi Jinping on Friday.

The 51-year-old First Lady wore a black, off-the-shoulder, cleavage-baring custom-made Vera Wang mermaid gown with a ruffled skirt and tulle straps. President Barack Obama, 54, looked dashing in a black and white tux.

"It is such a privilege, as an American of Chinese heritage, to have dressed First Lady Michelle Obama for this state dinner honoring President Xi Jinping and First Lady Peng Liyuan, of the People's Republic of China," Wang said in a Facebook post.

Xi Jinping, Peng Liyuan, Michelle Obama, President Barack Obama

Ron Sachs-Pool/Getty Images

First glance at tonight's China State Dinner.

A photo posted by First Lady Michelle Obama (@michelleobama) on

Also in attendance at the dinner were Facebook CEO and co-founder Mark Zuckerberg, 31, and his wife Priscilla Chan, 30, who is of Chinese descent and is pregnant with the couple's first child. She covered her baby bump in a sleeveless, red lace gown.

Zuckerberg revealed her pregnancy, as well as their fertility struggles, in a moving Facebook post in July.

Priscilla Chan, Mark Zuckerberg

MOLLY RILEY/AFP/Getty Images

Priscilla and I are attending tonight?s state dinner for Chinese President Xi Jinping. Here?s a photo before we head to the White House.

Posted by Mark Zuckerberg onĀ Friday, September 25, 2015

Earlier on Friday, FLOTUS and the Chinese First Lady named the Smithsonian's National Zoo's new baby panda—they called him Bei Bei.

Madame Peng and I were thrilled to announce the name of our @SmithsonianZoo's "precious treasure," Bei Bei! ?mo ?? #PandaStory

A photo posted by First Lady Michelle Obama (@michelleobama) on