Dane Bowers allegedly left the Playboy model with a bloody nose after attacking her at their home in Croydon, South London.
The alleged attack is said to have taken place in front of Sophia Cahill’s 12-year-old son.
Bowers has pleaded not guilty to one count of assault.
The 35-year-old is set to appear appear at Croydon Magistrates’ Court later today.
Katie Price’s ex proposed to Sophia Cahill in December 2014, and the pair were engaged for 12 months.
The relationship is said to have ended when the mother-of-two caught him with photos of glamour models stored on his phone last December.
She wrote on Twitter at the time: "When u want to mess about, make sure ur iPhone arnt linked to the same account."
Dane Bowers became famous in the late 1990s as a member of R&B group Another Level, going on to sing a duet, Out Of Your Mind, with Victoria Beckham.
He went on to appear in reality shows Celebrity Big Brother and The Big Reunion, before taking a pantomime role as Prince Charming.
Sophia Cavill was crowned Miss Wales in 2000, before going on to forge a successful modelling career.