Real estate mogul and 2016 presidential candidate Donald Trump doesn't shy away from a good feud, most recently with comedian Rosie O'Donnell and Fox News anchor Megyn Kelly. But this isn't the first time Trump has been involved in a war of words. Here are 13 of Trump's best media feuds.

1) Cher

Cher and Trump had gotten in many public feuds, most of them on Twitter. Their most famous blowout happened in 2011 when Cher urged her followers to not go to Macy's. The department store sold Donald Trump-branded products, which Cher did not like.

"ILL NEVER GO TO MACY'S AGAIN! I didn't know they sold Donald Trump's Line! If they don't care that they sell products from a LOUDMOUTH." She tweeted. Trump responded: "I promise not to talk about your massive plastic surgeries that didn't work."

3) Jon Stewart

In November 2011, Jon Stewart did an impression of Republican Presidential candidate Herman Cain on "The Daily Show." Trump said in a YouTube home video, "How come Jon Stewart gets away with a very, very racist rant about Herman Cain, nobody else could pull that off." Stewart later responded to the criticism, "This one hurts, because of how much I respect Donald Trump."

4) Seth Meyers

After being roasted by "Saturday Night Live's" Seth Meyers at the White House Correspondent's dinner in 2011, Trump did not just brush off the criticism: "I thought Seth Meyers, his delivery frankly was not good," Trump said on "Fox and Friends," noting, "He's a stutterer." Read the full exchange, as reported by Politico, here.

5) Bill Cosby

Trump flirted with the idea of a presidential run in 2011. On NBC's "Today Show," Bill Cosby dismissed the seriousness of the mogul's presidential ambitions, saying he needed to "run or shut up." Trump replied in a statement to "Today": "Sadly, [Cosby] got more attention talking about me than he did on the merits of his own appearance ... Maybe he is not as dumb as I thought."

Trump went after Cosby again when it was revealed that Cosby obtained Quaaludes with the intent of drugging young women in order to have sex. "I think he's guilty as hell. I mean, he's looking guilty. And that last week's event was very bad for him where they had the sealed documents unsealed," Trump said.

Read the full exhange, as reported by the Los Angeles Times, here.

6) David Letterman

In early 2011, Letterman quipped on his late night show: "It's all fun, it's all a circus, it's all a rodeo, until it starts to smack of racism. And then it's no longer fun." After learning of the comment, the mogul cancelled an appearance on the show and wrote a letter to the host, saying, "In actuality, nothing could be further from the truth and there is nobody who is less of a racist than Donald Trump," according to the New York Post.

7) Jerry Seinfeld

Donald Trump hosted a charity benefit in April 2011. Jerry Seinfeld was slated to appear, but canceled. Trump ripped the comedian in a letter, taking a shot at Seinfeld's "The Marriage Ref": "Despite its poor ratings, I didn't cancel on you like you canceled on my son and St. Jude." Seinfeld later said on Extra: "If God gave comedians the power to invent people, the first person we would invent is Donald Trump. ... God's gift to comedy."

Read the full story, as reported by the Hollywood Reporter, here.

8) Robert De Niro

In 2011, while Trump was on the hunt for Obama's birth certificate, Robert De Niro mused about the absurdity of the mogul's actions in an NBC interview from the Tribeca Film Festival. "It's like a big hustle; It's like being a car salesman," De Niro said. Trump responded on Fox and Friends: "I like his acting, but in terms of when I watch him doing interviews and various other things, we're not dealing with Albert Einstein."

Read the full story, as reported by the Hollywood Reporter, here.

9) Russell Brand

After Russell Brand appeared on Jimmy Fallon's late night show, Trump picked a fight with the actor, saying that he was not impressed with Brand's appearance on the show. He also tweeted to Katy Perry, Brand's wife at the time, to ask her what exactly it is she sees in the actor. Brand bit at the bait and responded by asking Trump if he was drunk. Brand was not pleased that he was being called out and tweeted a link to a story entitled, "Exposing How Donald Trump Really Made His Fortune: Inheritance from Dad and the Government's Protection Mostly Did the Trick."

11) Barbara Walters

During the 2012 election, Trump promised an October bombshell about Barack Obama. It turned out to be an offer of $5 million to release college transcripts. On "The View," Barbara Walters chided the mogul, saying, "you're making a fool of yourself. You're not hurting Obama, you're hurting Donald." Trump tweeted in response: "Barbara ... you just don't get it!"

13) Corporate America

"The Donald" faced a domino effect of backlash following his original campaign run announcement back in June. In his speech, he stated that Mexican immigrants are "rapists" who bring crime to the United States, which tipped off a set of corporations cutting ties with Trump. Univision refused to air the Spanish broadcast of Trump's Miss USA 2015 pageant. NBC Universal terminated its business relationship with Trump shortly after and cancelled its coverage of the annual Miss USA and Miss Universe Pageants.

Next to follow suit were Macy's, the city of New York, Serta mattress maker, supply store Camping World, NASCAR, ESPN, the PGA of America and the FAA, as reported by Gawker.