The 42-year-old has been dating Justin, 40, since early this year.
“He’s a charming young man. I think they make a wonderful couple. My wife and I get together with them whenever we can,” contactmusic.com quoted John Aniston as saying.
Jennifer, who was previously married to actor Brad Pitt, recently met her boyfriend’s cousin Louis Theroux, who gave her the thumbs up.
“Jennifer looked really chilled out and seemed blissfully happy. Louis obviously approved of Jennifer. It looked like they were having a great time, and they all seemed instantly at ease with each other. Justin looked proud of Jen (Jennifer) and seemed quite manly and protective,” said a source.