"George wants a big, booze-soaked, sky's-the-limit bash in an exotic locale like Mexico or Italy with his old drinking buddies, like Rande Gerber," shares the source. But Amal, 43, "is pushing for a quiet family celebration at home with their children [Alexander and Ella, 3], and it's led to a few arguments."
The Oscar winner, who just wrapped up shooting The Tender Bar in Ipswich, Mass., "figures it's his chance to finally let off steam and that it's his choice on how to mark the milestone occasion," the source explains. "He wants Amal and the other wives to come and join in on the fun, but watching George get wasted certainly isn't her idea of a good time. She sees nothing wrong with a dinner at home."
The source says Amal's "not into the idea of a week-long party with celebs she has nothing in common with."
The couple is planning more than just a birthday celebration these days. As OK! previously reported, George and Amal are thinking of having another child.
"George has let his inner circle know he plans on being a dad again," an insider said, explaining that he'd hinted to his pals that the baby might arrive "sometime after his 60th birthday in May."
The insider continued that if it were up to George, "he'd have a whole soccer team."
"He and Amal aren't getting any younger so they want to get on it as soon as possible," the insider explained.
Before the E.R. alum met the human rights lawyer in 2013, George admitted that children were never a part of his life plans.
"I was like, I'm never getting married. I'm not having kids," he revealed, adding that he was content to spend his days working and hanging out with friends. "I figured my life is full. I'm doing well."
The Oscar winner and Amal got married in a lavish Italian wedding in 2014 and welcomed their twins in 2017.