Shawn Mendes will be releasing his duet with Fifth Harmony's Camila Cabello very soon!

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There has been speculation for months about whether the teenage Canadian musician and the 5H member are loved up, but they have both shot down those rumors again and again.

The 18-year-old girl group member has been getting guitar lessons from Mendes and the two have been working on some music together. At the end of September an insider dished a duet would be on the way soon and that individual wasn't kidding!

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On Saturday, a 15-second long video clip was uploaded to YouTube of the duet Mendes and Cabello worked on together. It's called "I Know What You Did Last Summer" and there is even a corresponding website called https://www.ikwydls.com. The website currently has a TV static background with the hashtag "#IKWYDLS" and "COMING SOON" noted on it.

The song seems to have an up-tempo beat so it is sure to be a smash hit, but some Harmonizers appear to be salty that only Cabello is working with the Canadian.

On Saturday, Cabello sent out a few tweets, thanking fans for their constant support, but indirectly responded to those dishing out mean tweets about the duet.

"[A]ll [I] can say is [I] don't believe in putting chains on music," she said.

Cabello insisted the "support and love" given to her is what keeps her going on this musical journey.

She then exchanged tweets with a fan about the duet, revealing, "[I] hope you like it."

Handwritten Revisited drops on November 20 so fans of the two singers will find out soon enough if this duet will be included since one of the new tracks is currently deemed "Secret Track" while all the other new tunes' titles are known.