September 13, 2011 01:00 PM

Peter Brooker/Rex

Red carpet bump debut!

An expectant Jennifer Garner puts her belly on display as she hosts Saturday’s Pink Party, held at Drai’s in the W Hotel Hollywood.

The actress and husband Ben Affleck, both 39, say they are “thrilled” about the coming addition to their family, who will joins daughters Seraphina Rose Elizabeth, 2½, and Violet Anne, 5½.

Garner will next be seen in the film Butter.

RELATED: Ben Affleck, Jennifer Garner Expecting Third Child

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