First Lady Michelle Obama stuns in gold at Congressional Black Caucus Awards

Cementing her status as style icon, first lady Michelle Obama once again stole the spotlight as the Congressional Black Caucus' Annual Phoenix Awards, where Barack Obama was speaking on Saturday evening for the final time as president.

The event, held in Washington, D.C., pays tribute to the legacy and achievements of individuals who have positively impacted the African-American experience. The evening's honorees included Hillary Clinton, recipient of the Trailblazer Award.

PHOTOS: See their gorgeous evening

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Wearing a strapless gold Naeem Khan ball gown with hand-painted gold leaf on black tulle, it was hard to take your eyes of the first lady -- and even the president had to acknowledge his wife.

"I've been so blessed to have a wife and a partner on this journey who makes it look so easy," Obama said to applause as he spoke about their 10-year journey from the Senate to the White House. "And is so strong answer so honest and so beautiful and so smart."

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The evening look is just the latest in a series of stunning outfits, including Obama's understatement silk blue dress custom-designed by Christian Siriano that she wore at the Democratic National Convention in July.

Siriano, who had a headline-making summer, told ET about working with the first lady. "We make a dress [and] we hope it works," he says. "It's really funny when I have sometimes been working with younger actresses and they are so intense. I'm like, 'I've had less fittings on the first lady's dress than on you.'"

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As stress-free as designing for Obama may have been, it was still a huge moment to have a dress on the first lady as she delivered a stirring speech about the importance of female and black role models while declaring, "I'm with her."

"It's super important. She supports American designers, which is really great," Siriano says, "and that's what we're all here to do: We're here to make women feel their best."