Shawn Mendes and Camila Cabello perform 'I Know What You Did Last Summer' on The Ellen DeGeneres Show

I know what you did last summer (aah-ah)

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Shawn Mendes and Camila Cabello off of Fifth Harmony's duet 'I Know What You Did Last Summer' has been out for frickin' ages already; but it just never gets old. Nope. We're still properly obsessed. And d'ya know what? The pair's latest performance of the track on The Ellen DeGeneres show might just be their best yet.

Yup - while the 5H girls work hard perfecting their second proper studio album and tease new music 'really soon' (AGH) Camila's still promoting the #Shamila duet on all the big telly shows across the pond.

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Also as a sidenote we're totally loving the whole hair/playsuit situation; but that's another story for another time.

Camila Cabello and Shawn Mendes
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Chatting about the pair's relationship on the Universal Music GRAMMYs after party red carpet earlier this week, Camila explained: "Honestly, last summer we had countless panic attacks that we were there with each other for. We've gone through pretty big moments together, you know, like with the song that we wrote."

Check out the guys slayin' the stage below, if you fancy. Let's just ignore that Ellen pronounces Camila wrong. It's a minor slip-up.

SO GOOD.

What d'ya make of that, then? Give us a tweet over @sugarscape or drop a comment in the box below, please and a-thank you.

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