The singer, who came fifth place on the ITV talent show, looked sophisticated in the fitted knee-length frock at the Cirque Du Soleil: Quidam opening night, held at the Royal Albert Hall.
Tamera was all smiles as she posed for photographers, and showcased her return to darker locks, styling her hair into a top knot bun.
The 16-year-old didn't arrive with love interest Sam Callahan, but instead enjoyed the show with fellow X Factor contestant Hannah Barrett.
Taking to Twitter before the show, Tamera said: "Can't wait to hit the red carpet for the #cirquedusoleil premier tonight! And to see my girl @HannahBMusic."
Hannah, who recently performed a homecoming gig in Croydon with fellow X Factor contestants Rough Copy, looked chic in a black trouser suit.
Wearing a fitted white top, black shoe boots and gold chains draped around her neck, the 17-year-old singer looked effortlessly stylish.
The singer later tweeted: "@Cirque was amazing tonight! It was nice catching my girl @OfficialTamera & her family #Quidam."
The girls enjoyed the Quidam acrobatic show, along with the likes of Danielle O'Hara, Amy Willerton and Beth Tweddle.
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Check out Tamera's X Factor performance of 'The Voice Within' in the video below: