On Thursday, the “Yummy” singer gave his half-sister Bay Bieber, 20 months, a sweet shout-out on Instagram. Sharing a picture of himself and the adorable toddler, who is the daughter of his father Jeremy Bieber and wife Chelsey Bieber, having a twinning moment in their matching loungewear and beanies as they snuggled up with one another, Justin proved he’s the best big brother ever by posting an empowering message.

“Dear baby sis, you will grow up to be a confident, strong, kind, compassionate powerful woman!” he wrote. “Excited to watch you grow into the incredible woman you are DESTINED TO BE!”

That same day, Justin was joined by his other half-sister Jazmyn Bieber in the studio, where he gave the 11-year-old some musical pointers. She shared a picture with her big bro in the booth on her Instagram account, writing, “Learning from the best @justinbieber.”

Justin’s half-siblings always make the sweetest cameos on his social media, and recently, they appeared in the music video for his and Ariana Grande‘s social distancing-inspired duet “Stuck with U.”

During his verse, an adorable clip of Bay, Jazmyn and their siblings Jaxon and Allie danced along to the song’s romantic melody. The star-studded video also featured Justin’s wife Hailey Bieber, who shared some PDA moments with the “Intentions” singer throughout the heartwarming video.