"Briana is staying away from home for the moment. She's a private girl, she doesn't even have any social media," a friend told People. "Everyone's hoping she can have a smooth pregnancy in peace. That's the most important thing for everyone right now."
Briana's relocation may only be temporary as Louis is reportedly looking at properties in Los Angeles.
The L.A.-based stylist, 23, met the One Direction singer, also 23, earlier this year through mutual friends and on Tuesday, a source confirmed to ET that the two are expecting a baby.
Danny Fitzgerald, who was Briana's stepdad for 10 years before he and her mother split, also confirmed the pregnancy news to BuzzFeed News, saying, "I emailed her mother and asked if Briana got pregnant from Louis Tomlinson and if she was going to be a grandmother and she said yes."
Louis was spotted on multiple dates with Briana in the spring after splitting from long-time girlfriend Eleanor Calder in March. While the two are not a couple, they are "very close friends and this has brought them even closer," a mutual friend told People.