The making of the Katherine Heigl/Seth Rogen drama

We can all move along to Seth Rogen's Sausage Party because his beef with Katherine Heigl is done.

This week, Rogen definitely put an end to the feud with his co-star from the 2007 film, Knocked Up, written and directed by Judd Apatow. But in order to fully grasp peace, we must know war. Here's how the drama began nearly nine years ago.

1. Heigl calls the film "a little sexist."

The cover girl for Vanity Fair's January 2008 issue offends Rogen and Apatow when she talks about the movie.

“It paints the women as shrews, as humorless and uptight, and it paints the men as lovable, goofy, fun-loving guys," she says. "It exaggerated the characters, and I had a hard time with it, on some days... Why is this how you’re portraying women? Ninety-eight percent of the time it was an amazing experience, but it was hard for me to love the movie."

In an effort to clarify, Heigl expands on her comment to PEOPLE in Dec. 2007.

"I was responding to previous reviews about the movie the interviewer brought to my attention," the actress says.  

"Although I stand behind my opinion, I'm disheartened that it has become the focus of my experience with the movie," Heigl continues. "The truth is, it was the best filming experience of my career."

But as a the star of a kitty litter commercial, Heigl should know once the cat is out of the bag it's hard to put it back in.

2. Rogen makes it known exactly how mad he is.

The funny man and Apatow are guests on The Howard Stern Show in July 2009, to promote their film Funny People. When Apatow is asked about Heigl's comments, he seems to empathize with her.

"I think she was probably doing six hours of interviews and kissing everyone's (expletive), and then just got tired and slipped a little bit," he says.

But Rogen quickly refutes that excuse. "I didn’t slip and I was doing (expletive) interviews all day too," he says. "I didn't say (expletive)!"

Apatow admits he was waiting for an apology. ​"You're like well at some point I'll get a call like 'Sorry, I was tired,' and then the call just never comes."

Rogen identifies saying "crazy things" as "kind of (Heigl's) bag now," and both take the opportunity to rip her film, The Ugly Truth.

3. Rogen seems to have let the feud go.

While promoting 50/50, released in 2011, Rogen tells ShortList he has forgiven Heigl.

"I mean, you do so much press that, odds are, you’re going to say something (expletive) stupid every once in a while... And any one of them might wind up in a newspaper or a magazine at any given time. So at this point I’m much more forgiving of that kind of thing."

4. Heigl acknowledges her comments were "immature."

On The Howard Stern Show this April, Heigl takes responsibility for her words in a NSFW interview.

"I liked the movie a lot. I just didn't like (the character)," Heigl says. “Judd (Apatow) allows everyone to be very free and improvise... and afterwards, I was like, 'Why is that where I went with this? What an (expletive) she is!'”

Heigl admits that she should've called Rogen and Apatow and that she's "thought about writing a note."

She also says she would work with Rogen again but guesses he wouldn't want to work with her.

5. Rogen assures us there is no more feud.

He appears on Watch What Happens Live on Aug. 7 and explains to a caller he has no animosity for his former co-star.

"Honestly, it was so long ago, and I have damaged my brain so poorly in the last few years I have a hard time recalling even what it's about or who was supposed to be mad at who," Rogen says. "And I have no bad feelings toward her, honestly."

The next day, Rogen is a guest on The Howard Stern Show and reveals in a NSFW chat he recently watched Knocked Up.

"As I was watching it I was like, '(Expletive) we're so funny together, me and Katherine,'" he says. "And as we were making the movie honestly, I was like, 'I'll make a dozen movies with her. I would be whatever the (expletive) version of Tom Hanks and Meg Ryan is.'"

Rogen admits that his trust felt "somewhat betrayed," and he prefers personal apologies to public forums, but let's quit while we're ahead, shall we?

Might we suggest a #tbt to formally bury the hatchet?