Justin Bieber's Siblings, Jazmyn and Jaxon, Sing 'Baby'

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Too cute!

Justin Bieber's adorable half-siblings, Jazmyn and Jaxon, obviously look up to their big brother, as evidenced by this tape of the two of them -- as well as another super-cute pal -- singing his 2010 hit "Baby." Justin's dad, Jeremy Bieber, shared the footage on Vine on Tuesday.

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Justin has always been close with 7-year-old Jazymyn and 4-year-old Jaxon, continuously sharing pictures of them spending time together. In May, the 21-year-old superstar Instagrammed this sweet picture of him cuddling with Jaxon.

"Love you more than anything Jaxon," he wrote.

And here's Justin, Jazmyn and Jaxon all making funny faces together.

... Best big brother ever?

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Justin has been showing his charitable side lately, recently surprising a young boy with Down Syndrome and making his entire family cry. Watch the touching moment below:

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