As soon a pop partnership Calvin Harris and Taylor Swift got together, we knew it wouldn’t be longer before the two of them as an ordinary couple wasn’t enough for fans. And now, mere months into their relationship, gossip columns are ablaze with the prospect of an imminent engagement announcement from the pair.

Calvin Harris and Taylor SwiftMusic's biggest couple could be about to become part of music's biggest marriage

According to The Mirror, the Scottish DJ - who isn’t short of a bob or two - is preparing to shell out a whopping $500,000 on a fancy sparkler for the Bad Blood songstress.

A source is said to have told a US magazine that he has chosen a 10-carat diamond for his girl.

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The source said: "Taylor loves chunky rings, so he wants to go big."

While the source has an idea about Calvin’s jewellery choice - word is that he hasn’t yet decided where to pop the question.

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The source said: "He’s on the fence because Taylor has so many favourite places.

"He thought of romantic Paris or Italy, but now he’s leaning toward Nashville, where she has one of her homes."

Of course, if the rumours are true and Taylor has caught even a little glimpse at the news recently, Calvin might have to go bigger than a diamond ring and invent a time machine so he can add the element of surprise back into his proposal.