Inside Spencer Pratt's Shocking Los Angeles Mayoral Run — As Celebrities React to Former Reality Star's Unexpected Rise

Spencer Pratt's mayoral bid tore Hollywood apart, and RadarOnline.com can reveal all of the notable names who had something to say about his shocking and unexpected rise.

During the April 21 episode of Watch What Happens Live, Andy Cohen was asked for his opinion on Pratt's political move a year after The Hills alum lost his home in the Palisades Fire.

"If anyone is qualified to be mayor of L.A.," the host said.

Kristin Cavallari, who was a guest on Cohen's show, said she was "shocked, obviously."

"But if you actually listen to him, he knows his stuff. He's very well-spoken. Of course, Brody [Jenner] is going to endorse him, that's his best friend," she added. "Unless you live in L.A., it's kind of hard to have an opinion. These people lost their homes [in the wildfires], they lost everything, and so people are fired up and I have empathy [for] them. I'm here for it, and I honestly could see him winning. People in California really are excited about him."

When Cavallari mentioned Joe Rogan and his endorsement of Pratt, Cohen snapped, "Oh, Rogan, the great mind of the universe. Joe f------ Rogan. What a f------ idiot. Sorry."

Speaking to Us Weekly, Pratt's The Hills costar Audrina Patridge expressed excitement about his run for mayor of Los Angeles.

"He impressed me. I listened to some of his interviews, and at first, when I heard, I was like, 'Wait, is he really doing it? Is it a joke? Is it real?'" she added. "But he is, and he is very intelligent, and I think that he would make a lot of change to L.A., and he would follow through with what he said. I'm rooting for him."

Patridge said she hopes Pratt can help restore Los Angeles to what it was like "15 years ago, when it was fun to go out."

Jenner voiced support for Pratt by commenting on his co-star's post, calling him a "legend."

One day after Pratt's candidacy announcement triggered backlash, Jenner took to Instagram to defend his longtime friend.

"Let me clear something up. Spencer Pratt graduated from USC with a bachelor's degree in political science. He's genuinely one of the smartest people I've ever met. He didn't 'end up' in reality TV; he chose it because he loved it and understood the opportunity," he wrote in an Instagram Story post.

"And for everyone out there saying he 'doesn't have a job,' that just shows how little they understand the industry," Jenner added. "Being on a television show, yes, even a so-called 'reality' show, is real work. The shooting schedules are long, intense, and often more demanding than many of the traditional jobs people love to look down on."

Jenner concluded his post with praise for Pratt, telling his followers, "Spencer isn't afraid to think differently or speak up, and that's exactly what this city needs. He has my vote, because at the very least, he has the backbone to stand up to career politicians who've done little to actually move Los Angeles forward."

American executive Jeanie Buss did not publicly weigh in on the Los Angeles mayoral election, but she let her donation do the talking!

According to FOX 11, the Women of Wrestling co-owner donated $1,800 to Pratt's Los Angeles mayoral campaign, which is the maximum allowed amount under local election laws.

In an episode of his podcast, Rogan backed Pratt's mayoral campaign by publicly endorsing him.

"I can't vote for you, but I'm rooting for you," he said. "I mean, if I lived in Los Angeles, no question whatsoever, I would vote for you."

On the Tomi Lahren Is Fearless podcast, host Tomi Lahren asked Josh Duhamel to weigh in on Pratt running for mayor.

"I've heard him a couple times," he responded. "I think I saw him on one of the talk shows."

The All My Children alum acknowledged that Pratt "is very passionate" about his political shift and "seems to know what he's talking about."

"I don't know if he's going to win," he added.

As Lahren blasted Los Angeles Mayor Karen Bass over her wildfire response, she pointed out she is confident of Pratt because "that [Los Angeles wildfires] is his whole issue."

"Yeah, I think that's just one of the many things that people are struggling with there," Duhamel agreed. "But then again, I'm not going to hold out."

Katharine McPhee did not publicly back Pratt, but she is among the donors who contributed to the $539,616.85 he has raised for his mayoral campaign since January.

On the April 8 episode of Today With Jenna & Sheinelle, Cavallari, host Jenna Bush Hager asked Cavallari, Stephen Colletti and Lauren Conrad whether they support Pratt's political plans.

"I've seen it everywhere," Cavallari said before adding sarcastically, "New to me!"

"Well, I'm not a resident of Los Angeles," Conrad said before Cavallari chimed in, "I don't live in L.A. either, but I don't know, he's on to something, so we'll see what happens. I will always have a soft spot for Spencer."

As Hager awkwardly said Conrad was avoiding eye contact with her, she asked whether they "have all healed any past beef."

"Sure. You're asking me about someone I haven't spoken to in decades," Conrad answered.

Reacting to Pratt's mayoral run, Meghan McCain wrote on X on April 29, "I'm telling you this guy is going to win."

When Pratt confirmed his run for office on Instagram, Nick Viall showed support by commenting, "You have my vote."

Spencer's sister Stephanie Pratt raised doubts about his qualifications for the role and urged voters to reconsider their support in a series of since-deleted tweets.

"Spencer has done great work for the Palisades. But LA does not need another unqualified and inexperienced mayor. A vote for him is a vote for stupidity," she pointed out.

Sharing the reason behind her decision, Stephanie claimed, "Everyone saying I should support him no matter what. Sorry, he beat me up when I was 18 & put me in the hospital. So, no, he doesn't belong in the government. Run the Palisades all you want not LA."

She alleged in another tweet, "Almost forgot how it all started- he's the one who got me hooked on hard-core drugs at 15. I've kept this all a secret for years. He also had a hidden drug addiction. Now, do you get he shouldn't be running LA. Thank you. Amen."