Musician Paul Anka has won the sole custody of his son 11-year-old Ethan.
His ex-wife, former Miss Sweden Anna Åberg, is barred from having any contact with their son.
"It's the greatest day of my life. This was all about protecting Ethan. The system has worked," Anka, who wrote one of Frank Sinatra's biggest hits "My way", told pagesix.com.
Åberg hadn't seen the child in more than two years after Ethan testified that he "has an intense dislike of his mother".
But Åberg's attorney Lisa Helfend Meyer argued: "There is no evidence, no facts, no court finding on her being an unfit mother."
Meyer claimed that Anka, 75, prevailed using his fame and wealth.
"His reported income is about $300,000 a month," Meyer said about the pop star of the 1950s. He gave hits such as "Put your head on my shoulder" and "Diana".
"He's been able to out-lawyer a woman who doesn't have the finances or the celebrity to combat him."
Meyer argued in California's Ventura County Superior Court in favour of "family reunification" - the idea that a child turned by one parent against the other needs to be reunited with the aggrieved parent.
Åberg didn't help her cause when she confronted Anka's third wife, Lisa Pemberton, outside the courtroom and shouted, "Get a life!"
Pemberton replied: "I have a life ... with your child."