Shona, who plays Whitney Dean in the BBC One soap, showcased her vocals at the annual music and arts festival, which is held every July on the Berkshire bank of the River Thames.
This year welcomed performances from Lionel Ritchie and Jessie J, so we bet Shona was chuffed to have been standing on the same stage as them.
For her performance, Shona was joined by singing sensations Laura Mvula and Gregory Porter.
The 23-year-old wowed in a white gown with intricate flower detail, and looked like a true professional as she effortlessly sung with ease to a large audience on stage.
Classical pianist Fabio D'Andrea, who directed the show, told The Mirror: "I love to take an artist and have them shown in a different light, and the fact that Shona is known for her acting rather than her singing will make her performance all the more exciting to watch."
Shona, who has a background in musical theatre, has unleashed her singing talents before having performed with her EastEnders co-stars for Children In Need shows.
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