Women in Music 2016

Louis Tomlinson's Ex Slams New Girlfriend: 'You Will NEVER Be My Baby Son's Mother'

Kevin Mazur/WireImage
Louis Tomlinson of One Direction performs during ABC's Good Morning America at Rumsey Playfield, Central Park on Aug. 4, 2015 in New York City.

Briana Jungwirth -- Louis Tomlinson's ex and the mother of his son Freddie Reign -- took to Twitter on Wednesday (July 14) to send a message to the One Direction singer's current girlfriend, Danielle Campbell: “You can pretend all you want but you will NEVER be my baby son’s mother.”

Louis Tomlinson Seeks Joint Custody of Son

The tweet came after TMZ posted photos of Tomlinson and Campbell on the beach in Malibu, California, with Freddie in tow. (TMZ has since deleted the post with the beach photos.)

Tomlinson and Jungwirth welcomed their son Freddie just six months ago. Last month, Billboard confirmed that Tomlinson is seeking joint custody of Freddie.

Plus: A Boy Band 'Expert' Talks One Direction