'I Know What You Did Last Summer' Singers Camila Cabello and Shawn Mendes Dating?

Fifth Harmony singer Camila Cabello and Shawn Mendes have been performing their hit duet, "I Know What You Did Last Summer," and stealing the hearts of their fans in the process.

The two seemed so in sync together that dating rumors immediately followed.

The rumor about Camila Cabello and Shawn Mendes dating started when the two reportedly started flirting in September last year when they were on a tour together.

On Feb. 16, they performed their super catchy duet, "I Know What You Did Last Summer," on The Ellen DeGeneres Show.

According to PopSugar, the pair looked good during their performance.

Previously, they performed at the 2016 People's Choice Award where they were dazzling the stage.

Adding spice to their chemistry, the couple has been spotted on Republic Records party at Hyde Sunset Kitchen & Cocktails on Feb. 29 after the Grammys.

During an interview with Pop Shop Podcast, as shared by Billboard, Camila Cabello didn't exactly address the dating rumor with Shawn Mendes as she talked about their collaboration.

"Thank you to anybody who has been nice to 'I Know What You Did Last Summer. Thank you that was my child and Shawn and I say thanks."

"It's cool that he and I wrote it together and it wasn't something that was just handed to us," she added. "I think that's why it's been so fun and why I get so excited that we're getting to play it at these cool places."

"We had our hearts in it. That's what makes it special."

But in an interview with Entertainment Tonight, the singer didn't mince words about what the DJ/singer means to her, and it's not what the fans think.

"We are just friends. We're not dating," Mendes told ET. "Yeah, we're just friends. He's like, one of my best friends. He's amazing."