She may have been having her own "Terrible, Horrible, No Good, Very Bad Day," as Jennifer Garner headed back to her trailer on set in Los Angeles on Wednesday (October 9).

The "13 Going on 30" star braved the rain in a plum dress and gray jacket as she walked along in sneakers with a cold beverage in hand.

In the family flick based on the best-selling children's book, Alexander wakes up with gum in his hair, and things just get worse as his day progresses.

Joining Jen in the movie are Steve Carell, Bella Thorne, Jennifer Coolidge, and Megan Mullally. "Alexander and the Terrible, Horrible, No Good, Very Bad Day" is schedule to hit theaters in October 2014.