Here are five things to know about Briana Jungwirth, whom a mutual friend of the pair tells PEOPLE Tomlinson thinks "will be an amazing mother."
1. She is a stylist.
Jungwirth, 23, works in fashion – and despite multiple fake accounts in her name, is not on social media. She was been snapped in a number of chic ensembles while out and about with the One Direction singer.
2. She lives in L.A. – and Tomlinson is already looking for a home there.
Jungwirth and Tomlinson, 23, met through mutual friends and were spotted out together several times in May.
The friend adds that Tomlinson has flown back to L.A. to be by Jungwirth's side for every ultrasound so far and is looking at real estate near her so he can be a "hands-on dad" when the baby arrives.
3. She and Louis aren't dating anymore, but they're still ''extremely'' close.
"Louis and Briana care about each other very much and have spent a lot of time together privately over the last few months," says the friend. "They are both really happy and although they aren't in a relationship, their friendship is extremely strong, and they are both really excited about the baby."
4. She had never been to a One Direction concert until recently!
Despite having hung out with Tomlinson since May, Jungwirth hadn't seen him perform with 1D until just recently.
Adds the friend: "Briana is a really lovely girl; she's absolutely not interested in Louis' fame. She's very private, and most of the time they spend together is out of the public eye, just hanging out with their friends."
5. She's already gotten close to his mom.
Jungwirth and Tomlinson's families met for the first time in L.A. over the July 4 weekend and "really hit it off," says the friend, adding: "They are all excited and totally supportive.
Tomlinson's mom, Johannah, is a midwife, "so she's been able to give advice and has been a great source of support for Briana."