Stetson Mouser turns 3 on Feb. 23, which gives a good idea of how long Terrence Malick's "The Tree of Life," starring Brad Pitt and Sean Penn, has been in post-production. Stetson was a mere 4 days old when he pulled an eight-hour shift on the film, which opens in May. That's his foot on the film's advance poster.

"The movie is one of my ‘likes' on Facebook," said mother Heather Mouser, "so you can imagine how excited I was when they showed the poster and I saw my son's foot." It's not yet known if the current poster will be the official one when the movie opens May 27.

Stetson got the gig, which paid $75 for the day, when Mouser answered a casting call in Smithville for pregnant women. "The movie people asked me to give them a call when the baby was born," said Mouser, a stay-at-home mom whose husband is an electrician supervisor for JMEG. The couple also has an 8-year-old daughter, Chesney.

Mouser met Brad Pitt on the set during the filming and recalled she wasn't starstruck in the least. "He was just a nice, normal guy," she said. "I was just so enamored with my new son, I didn't really focus on anyone else."

"The Tree of Life" centers on the lives of three brothers, their father (Pitt) and mother (Jessica Chastain). Stetson Mouser portrays one of the brothers, perhaps Sean Penn's character, as a newborn baby.