Ballerina bump alert!

Natalie Portman arrived at LAX on Tuesday. The Black Swan actress, 29, carried her dog -- and revealed the first glimpse of a baby bump!

Early last week, the star confirmed that she's pregnant and engaged to the dad, dancer/choreographer Benjamin Millipied. See more pics of Natalie's growing baby bump.

"I have always kept my private life private," Portman told Entertainment Weekly in a brief statement. "But I will say that I am indescribably happy and feel very grateful to have this experience."

It's the first child for Portman, who met Frenchman Millipied on the set of Black Swan, in which he has as small role as a male ballet dancer.