Justine Keaton is a pre-made playable Sim residing in Sunset Valley, the world shipped with The Sims 3. She lives with her husband Marty and is pregnant with their first child, who is born the day after the start of the game. When first played, she is 12 days away from aging up into an adult.
The only people Justine knows outside of her household are one co-worker and her boss (usually Blair Wainwright and Hank Goddard, but not always in that order). When the game starts, Justine is on her third trimester of pregnancy, with her first child. She starts off with two skill points in athletic and is employed as a Patrol Officer in the Law Enforcement career. She carries the book Exit at Powell in her inventory.
Justine's maternity clothing is the same as a female cab driver's outfit.