Matty's older sister Kate, who Bachelor fans will know from her appearances on the show whilst she was pregnant, welcomed a baby girl named Millie on Monday.
Kate and her husband are also parents to a son named George.
“It’s hard as George is only 17 months, but she’ll be out soon,” Matty told YahooBe about Kate's hospital stay after the birth.
Matty, who has expressed his desire to start a family of his own, recently took his relationship with girlfriend Laura Byrne to the next level by introducing her to his nearest and dearest.
Congratulations to Matty J, we're sure he's definitely the ~fun uncle~
This article previously appeared on WHO.