By Daily Mail Reporter
Published: 18:50 EST, 22 May 2014 | Updated: 18:53 EST, 22 May 2014
She's normally known for her edgy approach to fashion.
But Jessie J showed that she can also rock glamour as she wowed in a floor-length vintage black gown as she performed at the Peace One Day Gala in the Salle des Etoiles, Monaco on Thursday.
The 26-year-old singer resembled Jessica Rabbit in the elegant Azzaro dress, which featured a dramatic strapless V-neckline and a thigh-split.
Elegance: Jessie J is stunning in a floor-length black dress as she attended the Peace One Day Gala dinner in Monaco
She matched the gown with metallic vintage Miu Miu sandals, while her look was perfectly set off with bold diamante earrings and a statement ring.
Her shoulder-length dark hair was worn swept to the side in feminine waves for a retro look.
Jessie went for dramatic eyes with a rose-gold eyeshadow while her lips were kept neutral with a pale pink glossy lipstick.
Special guests: Jessie poses with Peace One Day Ambassador Jude Law
Retro chic: Jessie wowed in a vintage dress and shoes with her hair styled into sleek waves
The gala dinner was accompanied by an auction of Formula 1 memorabilia and artwork from leading UK contemporary artists.
Also present at the event was Peace One Day Ambassador Jude Law.
The Peace One Day Gala is held to raise awareness of the campaign in the Republic of Congo and the the Great Lakes Region of Africa for One Peace Day, which is held on 21 September.
Preparations: A team of stylists get to work on Jessie's hair and makeup prior to the event
One Peace Day is a global day of action with campaigns and activities in Education, Music, Film, Sport, Dance, Art and Online, to support an annual day of ceasefire and non-violence around the world.
The organisation, founded in 1999, saw the member states of the United Nations unanimously adopt the first ever annual Peace One Day of global unity and intercultural cooperation in 2001.
Meanwhile Jessie has been jet-setting of late and recently performed her brand new song You Don't Know Me when she played a gig in Rock Wood in New York.
Campaign: Jessie J and Jude Law pose with English actor, filmmaker and founder of the non-profit organisation Peace One Day, Jeremy Gilley
Speaking before performing, she emotionally told the crowd: 'Please forgive me if I get this wrong, I've never sung it before. It's really honest about how I felt in the past year.
'Fame makes you feel like you have to be happy all the time and people want you to be perfect all the time and sometimes you don't want to take a photo with someone, sometimes you don't want to have a conversation with someone and it's not about being mean, it's about being human.
'That's the biggest thing that I struggle with that sometimes people need something from me that I don't have to give and I pretend sometimes that I am OK when I'm not and it makes me feel like I'm going mad,' she added, before breaking into the song itself.
The singer has also announced that she is confirmed to perform at this year's Capital Summertime Ball at London's Wembley Stadium.
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