May 08, 2012 09:00 AM

Axelle/Bauer-Griffin

Talk about a model momma: Alessandra Ambrósio delivered a son on Monday, May 7 in Florianopolis, Brazil.

Noah Phoenix Mazur joins big sister Anja Louise, 3½.

“Well, the day just arrived and we couldn’t be more happy!!! Noah Phoenix was born yesterday afternoon and already stole our hearts,” Ambrósio, 31, writes on her Facebook page.

“Anja is a proud big sister now and we are so thankful he is with us…”

“Welcome my son, can’t wait to show u around this crazy place,” fiancé Jamie Mazur, who began dating the Victoria’s Secret stunner in 2005, Tweeted Monday.

The couple announced they were expecting baby No. 2 last December, and in April, revealed that they were set to welcome a boy into the family — although Ambrósio and Mazur weren’t sure what they would call him just yet.

“[Choosing a name is] the hardest part! I want something that works well in both Portuguese and English,” she explained at the time. “It can’t be too American or my grandmother won’t be able to pronounce it!”

— Alison Schwartz

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