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Little JoJo Lomelino is melting out hearts again!

The 4-year-old has been getting plenty of attention for her sassy videos. In her latest one, the little girl with a big personality can’t believe what she just heard her little brother say.

When she heard little Isaac say “JoJo” for the first time, her face lit up! Watch her adorable reaction above.

JoJo went viral earlier this week for the wedding advice she gave to her dad: