Jennifer Garner: 'Serena' Trailer Released!

Jennifer Garner pushes her newborn baby boy Samuel in his stroller on Tuesday (May 15) in Santa Monica, Calif.

The 40-year-old actress, who was joined by her youngest daughter Seraphina, brought her little ones to a birthday party!

Earlier in the day, Jen and Seraphina spent some time together at a local playground.

A new trailer for Jen‘s upcoming short film Serena was just released. Jen plays a woman who is romantically interested in a priest!

The flick, which also stars Alfred Molina, will premiere on Tuesday (May 22).

FYI: Jen is using her Britax B-Safe infant seat and B-Ready stroller!

10+ pictures inside of Jennifer Garner taking Samuel and Seraphina to a birthday party…