Katy Perry Reveals She Would Collaborate With Former Friend Taylor Swift -- Under One Condition!

The 31-year-old singer appeared to wave the white flag during a Twitter Q&A on Saturday.

Katy Perry seems ready to end her feud with Taylor Swift!

During a Twitter Q&A with fans on Saturday, Perry wrote that she'd be down for a collaboration with Swift -- if the26-year-old singer apologizes to her.

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After a fan asked, "Will you ever collab with Taylor Swfit?", the "Rise" singer tweeted back, "If she says sorry, sure!"

While Swift has yet to respond, it's unclear if Perry truly waved the white flag or was hacked again (her Twitter account was just hacked this past May). ET has reached out to Perry's rep for comment.

Both cheeky and a bit telling was a tweet Perry, 31, sent a few hours after the Q&A, which read, "I love you pre Internet."

The rift between the pop stars stems from comments that Swift made in a 2014 interview with Rolling Stone magazine, where she noted a shaky relationship with an unnamed artist as the inspiration for her song, "Bad Blood."

"For years, I was never sure if we were friends or not," Swift told the publication. "She would come up to me at awards shows and say something and walk away, and I would think, 'Are we friends, or did she just give me the harshest insult of my life?'"

Perry's purported response was a tweet comparing Swift to Mean Girls character Regina George. She later confirmed the rift in a 2015 Billboard interview stating, "If somebody is trying to defame my character, you’re going to hear about it."

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Perry has taken swipes at her former friend ever since, including a tweet during Swift's Calvin Harris drama, that now infamous phone call recording with Kanye West,  and another possible dig in Elle magazine last year.

See more on the feud in the video below.