Channeling her inner Jessica Rabbit, the 'How We Do' singer oozed Hollywood glamour in a gorgeous fitted gown for the anniversary event.
She looks SO incredible, right?!
Dressed to impress, Rita chose to step out wearing the soft drink brand's iconic red colour.
Her floor-length frock flaunted her fabulous figure perfectly thanks to its corseted peplum design, leaving a long train behind the starlet as she walked by.
Teaming her dress with the ultimate accessory, Rita wore a pair of specially designed court heels featuring Coca Cola's logo.
And while you can't see her cool footwear in the pictures of Rita at the event, the 24-year-old made sure to showcase her shoes on Instagram.
Looking like a total siren in her snap, the blonde beauty is pictured wearing just a robe and her red and white heels. Alongside her photo, she said: "Good morning London....I love my Sophia Webster Coca Cola shoes..."
To finis her look, Rita made sure to turn up the glam on the beauty front too, matching her lipstick to her getup.
Ditching her newly-cut pixie crop for the occasion, she added some length to her blonde locks, styling her now tumbling tresses into soft, elegant curls.
All Rita's hard efforts didn't go unnoticed and she smouldered while launching Coca Cola's pop-up Contour Centenary Bar in Soho, London.
Rita's ultra-glam appearance in the capital comes after she spent the evening catching up with her fellow Voice coaches Sir Tom Jones, Ricky Wilson and will.i.am.
Excited to have the coaching panel reunited again, Rita made sure to take plenty of selfies with her celebrity pals while attending a press event for The Voice ahead of its first live show on Saturday night.
Rita is currently enjoying her first season as a coach on The Voice, and ahead of her debut, Marvin Humes told Reveal the starlet is "hungry to win".
Meanwhile, Rita - who replaced Kylie Minogue on the panel - admitted she initially had her reservations about joining the show.
"When I first thought about doing it, it's something that I had to speak to Will about first," she said. "I wasn't sure I wanted to take on that pressure... but then, I found my balls! I'm so happy I made this choice."
We think she's taken to being coach like a duck to water, don't you?!
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