Small children witnessed a man slap their mother over an argument involving a mobile phone.
Colin Richard Askew, 46, pleaded guilty to assault by beating in Buckminster Gardens, Grantham, on September 12, in the home of his ex-partner, the victim.
Daniel Pietryka, prosecuting, told the court the victim was slapped across her left cheek with Askew’s open right palm.
Mr Pietryka added: “One of the children was in the middle of this at the time. The woman was pushed away and some words were said.”
The victim suffered bruising and grazing to an arm as well as redness to her cheek.
Magistrates adjourned the case until November 9 for preparation of a pre-sentence report by the Probation Service. Askew, of Cheveley Park, Grantham, was granted bail with conditions not to contact the victim and not enter an address in Buckminster Gardens.