The 38-year-old singer has been dating the retired tennis ace and model for over a decade, reported Daily Express.
"I've never met my son's girlfriend. I have to tell the truth, I have never met Anna. Yes, my wife, and my kids and his brothers have, but I have never met her, no, no, never. Anna is very beautiful. They have good taste, my kids," Julio said.
The couple were hit with split rumours earlier this year.