There is, of course, her ex-husband Brad Pitt, who began dating Angelina Jolie very shortly after he and Jen split.
Then, there is John Mayer, who Jen wasn't with for all that long (about a year), but who is now obviously dating Katy Perry.
Given that John was kind of the bad boy when it came to relationships and nobody could really tame him until Katy came along, we could see where there might be some resentment or maybe even a little jealousy, but as it turns out, that isn't the case at all.
"Jen and John have stayed friends.They're not super close at the moment but Jen has said she likes the John-Katy pairing a lot and wants to see them start a family together," a source tells RadarOnline.
It definitely helps that Jen is so happy in her relationship now, too, though.
"When she was single, she didn't want to hear a thing about John's hook-ups," the source added. "And to his credit, he kept his personal life pretty low key for the two years after they broke up."
We're glad to see that there are no hard feelings...and most importantly, that everyone is happy!