Cold Feet? Why Joe Manganiello Is 'Flipping Out' Over Marrying Sofia Vergara -- 'Stressing Him Out Big Time'

Magic Mike XXL star Joe Manganiello is about to have a super-sized meltdown and RadarOnline.com has exclusively learned that it has to do with his upcoming wedding to Sofia Vergara.

"Joe is low-key flipping out right now," a friend of the 38-year-old hunky actor tells RadarOnline.com.

"He said that he does not think he is ready and all of his friends are telling him to calm down and that he is just having a case of the cold feet."

What could possibly make anyone, who is about to marry one of the world's richest and most beautiful women, nervous?

As RadarOnline.com previously reported, Manganiello and his 43-year-old Modern Family bride-to-be, who recently celebrated their one year anniversary, are set to marry at The Breakers in Palm Beach, Florida, at the end of November in front of 300 of the couple's close friends and family.

"She has made this wedding a huge production with way more guests than he initially wanted," the source says.

"Sofia's having people fly in from all over the world and two-thirds of the guests that are coming are invited by her. Joe keeps his circle very small."

Not to worry, though, because the insider tells RadarOnline.com, "Joe knows that she is just trying to make sure everything is perfect for their big day."

"It is all just really stressing him out big time."

Do you think that Joe Manganiello and Sofia Vergara will stay together? Tell us your thoughts in the comments below.