Time sure does fly!

Lourdes Leon, who is the eldest daughter of Madonna, is NOT a little girl anymore — in fact, the 19-year-old has grown up into a BEAUTIFUL young lady.

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The teen was spotted on the Upper East Side of NYC dressed in an all-black ensemble as she roamed around with her headphones in. She was seemingly by herself and appeared focused while she carried a plastic bag and sipped on a beverage.

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Madonna also has three other children — Rocco, Mercy and David.