Story highlights Grande returned to the UK ahead of a benefit concert for victims

Visit comes almost two weeks after a bomb killed 22 people at Grande's concert

(CNN) American singer Ariana Grande made a surprise visit with fans injured in last month's terror attack at her concert in Manchester.

The pop star surprised youngsters Friday night at the Royal Manchester Children's Hospital ahead of a benefit concert Sunday for victims of the attack.

"Ariana brought everyone a sunflower and a teddy bear," Lauren Thorpe told CNN. "It was unbelievable."

Thorpe's eight-year-old daughter, Lily, suffered a shrapnel wound in her back and is currently recovering from surgery.

"Lily's face lit up and Ariana was amazing with her," Thorpe said. "She knelt by her and sat on her bed with her and told her 'I'm so proud of you, you are so strong and doing really well'."

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