Ghosts of Girlfriends Past featured Christa B. Allen as a young Jennifer Garner. She is the same actor used to portray young Jenna in 13 Going on 30. Christa looked remarkably like a young Jennifer Garner in 13 Going On 30 and it appears she does so again in Ghosts of Girlfriends Past. Above you can see a picture of Christa B Allen now, and a picture of Jennifer Garner taken approximately 5 years ago. I wonder if in a few years Violet Affleck will be playing a young Jennifer Garner in a movie? Who knows, we’ll just have to wait and find out.