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Some of the young patients at Children’s Hospital Los Angeles had a very special guest for story time.

Meghan Markle, Duchess of Sussex, made a secret visit to the hospital on March 21 as part of CHLA’s Make March Matter Campaign.

On Tuesday, the hospital posted photos on Instagram of her reading to patients for its Literally Healing storytime.

Instagram: Children’s Hospital Los Angeles

Patients were laughing and singing as the Duchess read her favorites like “Rosie the Riveter,” “Pete the Cat,” and “I Saw a Cat,” according to CHLA.

The fun didn’t end there.

The hospital said the “mom of two also helped kids with activities tied to each book that let kids explore counting, colors, problem-solving and more.”

Literally Healing is the hospital’s reading program “that gifts families at CHLA more than 65,000 books annually and provides a unique opportunity to promote literacy, as well as supports and strengthens our patient families through additional therapeutic literary resources.”

The Duchess’ rare public appearance comes over a week after her sister-in-law, Catherine, Princess of Wales, revealed she has been diagnosed with cancer and is undergoing chemotherapy.

Both Prince Harry and Meghan have said they wished “health and healing” for Kate amid this difficult time. They also called for her and her family to heal “privately and in peace”.