Did Marc Anthony Cheat on Jennifer Lopez with a Stewardess?

"Q'Viva?" More like "Q'Cheat-a!"

...I'm working on that one. But here's the scoop: sources close to Marc Anthony and Jennifer Lopez are reporting that the couple hit a rough patch a couple of years ago when Anthony had an affair with a stewardess!

The stewardess (sorry, "flight attendant") was on a private flight that Anthony took back in 2009, without the company of his wife or kids. And according to the source (who spoke to US Weekly), the couple "almost split up over it."

Of course, we know that they stayed together until just recently, when the two announced that they were ending their seven-year marriage. Since then, we have learned quite a bit about what these recent years looked like for the couple, including Anthony's jealousy over J.Lo's career and his attempts to control her wardrobe choices on TV.

Here's where it gets really good: Anthony was also reportedly paranoid about J.Lo cheating on him with other men, which is (at this point anyway) completely unfounded. Sounds like Marc's guilt was getting the best of him, eh?

Still, the couple's show "Q'Viva" is supposed to continue on as planned...even though as far as the marriage goes, Jennifer has decided to "Q'Leave-a."