Well this answer would assume we know for sure the celebrity is nice and kind hearted, which, unless you know them personally, we really can’t know for sure.
With that out of the way, and going strictly by what I’ve seen in public from them, I nominate:
Jennifer Aniston and Brad Pitt.
Jennifer Aniston was America’s sweetheart at the height of her fame at the time she married Pitt—she was one of the actors on the wildly popular TV show Friends.
Her wedding to Pitt was one of the biggest Hollywood events of the time.
The marriage collapsed when Pitt left Aniston for Angelina Jolie, who he met on the set of the movie Mr. and Mrs. Smith, and began an affair with. The rumors were that Pitt wanted a family, and Aniston either couldn’t have children or was resisting having them, at least while she was starring on Friends. In any case, the marriage was reportedly under strain when Pitt began his affair.
Pitt of course went on to move in with, eventually marry Jolie, and had numerous children with her, both biological and adopted.
The split naturally devastated Aniston, who by all accounts really loved Pitt, and she was hurt further by Pitt going on to have a family with Jolie, something she also reportedly wanted.
Pitt and Jolie, along with their children became a power couple/family, the toast of Hollywood and politics when Jolie got involved in international issues and spoke at the UN on numerous occasions. They and their children were talked about and written about extensively, which had to really poke at Aniston, who by then wasn’t as high profile as she had been when she married Pitt.
While Jolie was making news for getting involved in world causes and appearing before the UN, and Pitt was becoming more popular as an actor, Aniston was largely being talked about as Brad’s ex-wife and having to deal with Pitt and Jolie being splashed across practically every tabloid and magazine with fawning stories about their kids and their projects. Aniston’s career at the time Jolie and Pitt were flying high was in a lull, at least compared with where she was when Friends was on the air. Nobody was talking about her projects nearly as much as they were talking about her private life, which had to be disheartening for her.
Pitt rubbed Aniston’s nose in his relationship with Jolie, and reportedly Jolie also was quite the mean girl as well—but Aniston refused to personally publicly slam Pitt ot Jolie in any way or to say anything about her marriage to Pitt that painted him in a negative light. Instead, she kept quiet about her marriage to Pitt and whatever feelings she had about Jolie essentially stealing her husband and disrespecting her marriage with that affair, carried on with her life, and built her career amid all the tabloid stories about her drowning her sorrows in booze, drunk dialing Pitt to beg him to come home, and being pregnant with some guy’s secret baby every other month.
Meanwhile, while Aniston was living her life, working on mending her heart (and admittedly making mistakes in that department—her marriage to Justin Theroux didn’t last long) and putting her career together, Pitt’s marriage blew up in part because Jolie is/was mentally unstable. Jolie eventually left him and is currently fighting him for custody of their children.
Can’t say I have much sympathy for Pitt—karma is biting hard. He married Jolie primarily because his little head overrode his big head—it’s hard for me to believe that he didn’t know Jolie had mental issues before he married her. The woman had worn a vial of blood around her neck when she was married to Billy Bob Thornton, for crying out loud. That’s weird, even for a Hollywood actress. Hell, marrying Billy Bob Thornton PERIOD would have made me think twice about whether your mental health was optimal. Anyone check out the fact the man has had six wives so far? Jolie was his fifth wife.
Aniston is even reportedly friends with Pitt now. Aniston is, no matter how you feel about her as an actor, a pretty class act as a human being, and a person with a strong character—despite the tabloid reports about her falling apart and being addicted to booze or whatever she was rumored to be on, there is no real evidence of destructive behavior or acting out on her part after the split. She looks physically healthy to me with no sign of premature aging, which at 50 would have been obvious if she was abusing drugs or alcohol. There have been no instances of embarrassing or negative public behavior or acting out. Nobody has come out and claimed she was difficult to work with or has been flaky with regard to her work. Given that she has been able to work continuously since Friends ended she in all probability has not been abusing drugs or alcohol and has managed to be professional in her dealings with the people she works with. Women over 40, especially if they have behavior or addiction issues generally find it difficult to find work in Hollywood, and Aniston hasn’t had that problem.
I am not a real fan—I can take or leave Aniston as an actor. I thought Friends was just an ok sitcom at best and don’t understand the hype surrounding this particular project of hers myself. But there’s no question Aniston is a quality person. She has for the most part conducted herself with a lot of dignity, grace, and self control. Pitt is getting everything he deserves now (except the friendship with Aniston—she should leave him alone, IMHO).