The driver of the other Mini vehicle also told the court they thought they could have died in the incident.
After being involved in a collision with two other cars on 18 March in Mortlake he was breathalysed and found to be more than two times over the drink drive limit.
District Judge Barbara Barnes told Ant: "You are a well-known and successful entertainer", whose weekly income is estimated to be around £130,000 a week.
Ant's driving ban could be reduced to 15 months, provided he completes a referral programme by the middle of May next year.
She added: "I think it will have quite an impact on you to know you're no longer a man of good character". He is now undergoing treatment for his alcohol issues.
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By the time she gets the kids home and has supper on the table, it is already getting close to bedtime for her younger children. Runyeon has slightly more than one year left on her only term as an elected member of the Harford County Board of Education .
In a statement read out in court, McPartlin said he "accepts full responsibility" for the incident. He also said that he felt "ashamed and mortified" for what he'd done.
He said: "Anthony McPartlin is sorry and is doing everything he can to ensure this never happens again".
The court heard Ant's barrister Liam Walker said his client had been seeking help for "alcohol and emotional issues" at the time of the crash.
After he was charged, ITV announced Ant would step down from his TV commitments on Saturday Night Takeaway, with co-presenter and BFF Declan Donnelly hosting the final two episodes of the show in Florida on his own.
He has now stepped down from his role as a host on Saturday Night Takeaway and Britain's Got Talent which have been hosted by his TV partner and close friend Declan Donnelly.