Jungwirth, 23, showed the makings of a tiny baby bump while leaving a passport office near Los Angeles. The stylist's white t-shirt and black yoga pants gave a glimpse of her bare stomach as she walked through the parking lot.
One Direction Star Louis Tomlinson Is Going to Be a Dad! Expecting Baby with Briana Jungwirth
News of the pregnancy broke in June, and soon after Jungwirth left her California home to escape some of the immediate public scrutiny.
Tomlinson, 23, opened up publicly about fatherhood for the first time during an appearance on Good Morning America last week.
"Obviously, it's a very exciting time," he told host Michael Strahan.
The singer met Jungwirth through mutual friends earlier this year after splitting from his longterm girlfriend Eleanor Calder in March.