Beyoncé is one proud big sister.

Taking to social media over the weekend, the mega star showed love to her younger sister, Solange Knowles, for her latest accomplishment of composing an original score for the New York City Ballet.

Alongside two photos of Solange — one of her holding several flower arrangements and another of her looking and waving to someone out of frame — Beyoncé wrote in an Instagram post. “My beloved sister, there are no words to express the pride and admiration I have for you.”

“You are a visionary and one of one,” she continued. “Congratulations on being the first African American woman to compose for the New York City Ballet. The piece you composed is phenomenal.”

“I love you deep,” the “CUFF IT” singer added. “Might I suggest you don’t f*** with my sis.”

Solange debuted her work at the annual Fall Fashion Gala at New York’s Lincoln Center on September 28.

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