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Jensen Ackles,Jessica Alba

Jensen Acklesis opening up about working withJessica Albaon the set ofDark Angel.

During a Wednesday appearance onInside of You: Michael Rosenbaum,the host asked Ackles, 43, what it was like to work with Alba, 40, on the Fox series, which aired from 2000 to 2002.

“Horrible,” Ackles said. “I’m not kidding. I’ve told this to her face.”

Ackles clarified: “I love Jess, which I know kind of contradicts what I’ve just said … She was under an immense amount of pressure on that show. She was young, she was in a relationship with [costar Michael Weatherly], and that was rocky and causing some undue stress I believe on set.”

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He described his connection with Alba as “the worst kind of bickering a brother and sister could do.”

“She had it out for me,” theSupernaturalstar added.

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He confirmed the Honest Company founder called him out in front of the crew and that he decided to fight “fire with fire,” ultimately leading to a “mutual respect” between the stars.

Ackles recalled how Alba was supportive after his grandfather died while they were filming the series. “She literally just walked into my trailer and held me for half an hour,” Ackles shared. “It was that kind of a relationship.”

He said of their friendship today, “If she walked in, we’d be all hugs.”

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A rep for Alba did not immediately respond to PEOPLE’s request for comment.

In 2012,Jessica Albashared her experience on theset, revealing she felt “objectified.”

“I had a show [Fox’sDark Angel] that premiered when I was 19,” Alba toldMarie Claire. “And right away, everyone formed a strong opinion about me because of the way I was marketed. I was supposed to be sexy, this tough action girl. That’s what people expected.”

" I felt like I was being objectified, and it made me uncomfortable," she explained. “I wanted to be chic and elegant!”

source: people.com