Model Adriana Lima gave birth to her second child on Wednesday.
Born in New York City, baby Sienna weighed approximately seven pounds.
Adriana wrote to fans on Twitter, celebrating the newborn's arrival.
She said: "Marko and I are overjoyed to welcome Sienna into our family, and Valentina is looking forward to becoming a big sister."
Married to former basketball player Marko Jaric, the couple's eldest daughter, Valentina, will turn three this November.
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