The singer's sibling is best known for her role as Eva Longoria's daughter on 'Desperate Housewives.'
Madison De La Garza has grown up quite a bit since her Desperate Housewives days.
Demi Lovato's sister -- who portrayed Eva Longoria's daughter, Juanita, on the ABC drama -- turns 16 on Dec. 28, and celebrated a little early with family and friends.
The 25-year-old pop star shared pics and videos from her sibling's party on her Instagram story, which revealed how much De La Garza looks like her older sister. The birthday girl wore a sleeveless white gown with a diamond encrusted belt wrapped around her waist, while Lovato chose a sexy pin-stripe suit.
Lovato's family went hard on the dance floor, with the "Sorry Not Sorry" singer posting videos of both her mom, Dianna, and her dad, Patrick, busting a move.
De La Garza's sweet 16 party comes just a few months after her former onscreen mother reunited with her Desperate Housewives co-star, Felicity Huffman, on the red carpet -- and ET was there!
Check out Longoria's big reunion with her cast mate:
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