Alessandra Ambrosio and fiance welcome baby boy

Alessandra Ambrosio arrives at the 20th Annual Elton John AIDS Foundation's Oscar Viewing Party on Feb. 26, 2012, in West Hollywood, Calif.
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(CBS News) It's a boy for Alessandra Ambrosio and her businessman fiance Jamie Mazur. The Victoria's Secret model gave birth to Noah Phoenix Mazur on Monday

Pictures: Celebrity babies
Pictures: Victoria's Secret Fashion Show 2011

"Well, the day just arrived and we couldn't be more happy!!! Noah Phoenix was born yesterday afternoon and already stole our hearts," Ambrosio, 31, wrote on Facebook.

He joins the couple's 3-year-old daughter, Anja Louise.

Mazur also chimed in on the news:

Mazur and Ambrosio have been dating since 2005.

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