Beyoncé was a proud big sister after Solange Knowles made her debut as a ballet composer at the New York City Ballet Fall Fashion Gala last week.

The singer took to her Instagram page to salute her younger sibling for the September 28 performance. Solange became the first Black woman to serve as a ballet composer for the New York City Ballet, an achievement her family celebrated.

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Bey shared two photos of Solange in her post, one holding two bouquets of flowers and another with her walking into the venue. In her caption, Beyoncé made it loud and clear she’ll always have her sister’s back.

“My beloved sister, there are no words to express the pride and admiration I have for you,” the “Break My Soul” singer wrote. “You are a visionary and one of one. 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. Might I suggest you don’t f*** with my sis.”

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Solange spoke to Vogue about the huge accomplishment, thanking her family and friends for attending the show while highlighting the work that it took to pull off the show that night.

“This evening has been in the works for a long time now,” she said. “The process of composing for the ballet was an inspiring journey for me. Exploring this form of expression and now getting to share it with my friends and loved ones tonight has been incredibly rewarding. It’s certainly a celebratory evening.”

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The sisters were bred for success, as made evident by their father, Mathew Knowles, who revealed how he prepared Bey and Solange for some of the mishaps that can come up during live performances in July. According to Mr. Knowles, it’s important to practice how to respond to something not working in your favor.

“One thing I taught Beyoncé and Solange was to practice failure,” he tweeted. “We would practice how they’d respond if their microphone got cut off, if their shoes broke on stage, if the wrong song got queued in their performance set.”

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He added: “Anything can happen… and they were always prepared to have a response! I would like for you to consider the same lesson. Whether you’re a performer or artist, or an entrepreneur or professional, practice how you’ll respond in the event you fail. It’s a skill that can and should be developed!”