Mabel pulled out all the stops as she arrived at Capital's Summertime Ball on Sunday night at Wembley Stadium, looking incredible in a backless minidress.
The BRIT award winner, 26, looked sensational in the black number, that showed off her entire back for an extra dose of sex appeal.
The skintight outfit clung to her curves and highlighted her toned legs, while boasting cutouts to flash an extra peek of skin.
She elevated her height in a pair of leather knee-high boots and sported bright blue eyeshadow with little gems to make her eyes pop.
Mabel wore her long raven locks in soft waves that tumbled down her back, with little braids in the front.
The singer later changed into a new outfit for her performance at the concert, that was equally as showstopping.
She slipped into an electric blue patterned co-ord, made up of figure hugging trousers and asymmetrical crop top to flash a glimpse of her toned tummy.
She laughed as she energetically danced around the stage with her backing dancers, in a pair of casual white trainers.
Her performance comes after Mabel revealed at the height of her success she was going on stage 'in complete and total utter fear' partly over how she looked and due to the fact she was secretly suffering with glandular fever.
The songstress has been living with the infection for the past two years which has caused her serious voice problems.
The Don't Call Me Up singer picked up the BRIT for British Female Solo Artist in 2020, but then developed voice issues and was constantly tired with a swollen throat.
Eventually she discovered she was suffering from glandular fever which causes extreme tiredness, swollen glands and a high temperature.
Mabel exclusively told MailOnline: 'When we're on promo tours and tours you're using it a mad amount. And then flying.
'I kept thinking that I had Covid last year, and all my PCRs have come back negative. And then I did loads of tests because I was like constantly tired and really, really swollen throat and just like would even get a fever.'