06/25/2015 09:38 am ET | Updated Jun 25, 2015

Beyoncé Celebrates Solange's Birthday With An Adorable Throwback Photo

Christopher Polk via Getty Images

Sisterly love!

Beyoncé shared a sweet throwback photo on Wednesday in honor of younger sister Solange's 29th birthday. The singer posted a gold glitter-flanked Polaroid of herself and her sister as budding fashionistas, writing "Happy Birthday to my sis! I love you deep."

🎈🎈Happy Birthday to my sis!🎈🎈I love you deep. 💃🏽💕

A photo posted by Beyoncé (@beyonce) on

Solange also posted a celebratory Instagram photo, a snap from her fifth birthday featuring a Disney kiddie pool. "Thanks for all of the lovely birthday wishes," she wrote in the caption. "Gratitude. I'll be in the park with my man, smoking a joint, listening to Joni, thanking the universe for this existence that is life."

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