Alia Ziggfield is a pre-made Sim, from Midnight Hollow. She resides in Grimy Residence with her husband wife David, at 110 Shearin Stroll.
Her husband is a reference to David Bowie, while Alia is a reference to Bowie's wife Iman, whom she resembles and is also a model. Their surname, Ziggfield, is likely based on persona Ziggy Stardust, created by Bowie.
She is implied to have been a model turned surgeon. However, no modeling career track exists in The Sims 3. Alia is indeed employed in the medical career track, but at level 4, as a Medical Intern.
Alia starts with 8 skill points in gardening, 5 in writing and 3 in logic. Her job requires her to upgrade her logic skill to level 7.
If The Sims 3: Late Night is installed, Alia will be 1-star celebrity. Despite being a celebrity, Alia does not know anybody outside her household, aside from her boss, whom she will be acquainted with.