AceShowbiz -

George Clooney and Amal Clooney have already come up with a name for one of their babies. The "Tomorrowland" actor, who is reportedly expecting twins with his wife, is already thinking about baby names for his son.

"[George]'s gone from never wanting to be a father to being totally excited about the pregnancy and the thought of raising two children who will call him Dad. He's been doting on Amal's every need and talking to her belly. He's also having a blast coming up with baby names," a source tells InTouch, "The name Nicholas - after his dad, Nick Clooney - is a shoo-in for his son. As far as girl names, he's leaving that up to Amal."

According to the site, George and Amal had a difficult time conceiving before turning to IVF.

"They had been trying for a baby all summer and it just wasn't happening, so they sought the help of a fertility doctor and started in vitro fertilization," the source explains, "George has never had trouble doing anything in his life. Plus, Amal is afraid of needles, so her biggest fear was getting the hormone injections."

The source continues, "They can't believe in just a few months, they're going to have two babies. They're having so much fun looking at all the latest baby gadgets and getting everything ready for the twins. They're going to be such amazing parents."

Amal fueled pregnancy speculations after stepping out with what appeared to be a tiny bump at a special screening of Netflix's documentary "The White Helmets" in London earlier this month.