Louis Tomlinson's mother has been advising Briana Jungwirth on her pregnancy.
The One Direction singer and the Los Angeles-based stylist - who are not in a relationship - are expecting a baby together and the 23-year-old pop star's midwife mum Johannah is excited at the prospect of becoming a grandmother.
A source told The Sun newspaper: "Being a midwife, Johannah has been able to give Briana advice when she has had questions.
"Briana's family are great and have hit it off with Louis' mum and his stepdad Dan."
Briana is said to be around 11 weeks along in her pregnancy and the 'Night Changes' hitmaker - who split from long-term girlfriend Eleanor Calder in March - is "very protective" of her and their unborn child.
The source added: "It's early days and the most important thing is Briana's health. Louis is being very protective of her and making sure she takes it easy.
"Louis is really excited about becoming a dad. Briana is a very private person and she and Louis have enjoyed hanging out with their friends over the last few months out of the public eye.
"Although they aren't in a relationship they have a strong bond and are both focused on the baby."
While they are not in a relationship, friends say the baby news has brought the British star - who is now hunting for a house in Los Angeles - closer to Briana.
The source said: "Louis is really excited about becoming a dad.
"It was obviously a surprise but they are both really happy.
"Louis and Briana have spent a lot of time together and are really close.
"Louis really cares about Briana and thinks she will be a great mum. Their friendship has got even stronger though this."