Seth Rogen
Seth Rogen opens up about his alleged feud with Katherine Heigl. Getty Image/Jesse Grant

Seth Rogen is finally clearing the air regarding his longtime feud with “Knocked Up” co-star Katherine Heigl.

During a recent guest appearance on “Watch What Happens Live,” the 34-year-old “Neighbors" star was asked about his beef with Heigl, 37, and whether or not he’s willing to work with her again.

“Katherine Heigl said on Stern that she would like to work with you again, but you’re still mad at her. Is that true?” the caller asked on the show’s Sunday, Aug. 7 broadcast.

However, Rogen was quick to shoot down speculation that he ever had hard feelings toward Heigl.

“No, I was never mad,” he shared. “I was never that mad, honestly, and I assumed she she didn’t want to work with us anymore, honestly, because she seemed to not like the result of the work we did together.”

Rogen and Heigl’s alleged bad blood has spanned 10 years and stemmed from the “Grey’s Anatomy” alum’s controversial remarks about their 2007 movie, Us Weekly noted.

Knocked Up
"Knocked Up" starred Seth Rogen and Katherine Heigl. Knocked Up Official Poster

Heigl criticized the movie during her 2007 interview with Vanity Fair, where she implied that “Knocked Up” is sexist and “paints the women as shrews,” while the men are “lovable.”

“It was hard for me to love the movie,” she told the mag at the time.

Heigl’s comments irritated Judd Apatow, the director of “Knocked Up,” and Rogen, who then later fired back at the actress with some critical words of his own.

During a 2009 interview with Howard Stern on his Sirius XM radio show, Rogen called out Heigl and her movie “The Ugly Truth.”

“That [movie] looks like it really puts women on a pedestal in a beautiful way. I hear there’s a scene where she’s wearing…underwear…with a vibrator in it, so I’d have to see if that was uplifting for women,” he joked.

But according to Rogen, he’s already put the whole thing behind him and doesn’t hold any grudge toward Heigl over what she said.

"She did not seem entirely pleased with it afterward,” he said of their movie. "I think that was the root of everything. But honestly it was so long ago, and I have damaged my brain so badly in the last few years, I have a hard time even recalling what it was about or even who was supposed to be mad at who, and I have no bad feelings towards her at all, honestly.”

Heigl has also moved on from the drama.

She admitted during an interview with Stern earlier this year that her comments about “Knocked Up” were “immature,” and that she has not yet apologized to Rogen and Apatow.

“I absolutely owe anybody an apology who I unwillingly offended or disrespected,” said Heigl.