Taylor Swift’s Secret Wedding Song for Travis Kelce

As strode into Electric Lady Studios, she flashed a knowing smirk at the hordes of paparazzi waiting outside.

Indeed, her Monday arrival at the legendary recording studio sparked frantic whispers of a thirteenth album from the 36-year-old pop star.

But a source tells the Daily Mail that instead, Swift might have been working on a wedding present for her soon-to-be-husband ...

'Taylor is creating a beautiful love song for her future husband. She has been writing it for the past few weeks, she's very excited about it,' the source said, adding that it is 'a sweet ballad' that will have 'a hypnotic chorus.'

'The lyrics will be about what makes their relationship click and will hint at the special, private moments they have had together.'

What's more, it appears Swift both plans to perform the song at her wedding reception and release it to the public the same day, the source said.

'It seems like Taylor has been recording the song in New York City as a single to be released on her wedding day, that sounds like a move she'd make, but who knows,' the source said. 'Blake Shelton released his wedding song for Gwen [Stefani], We Can Reach the Stars, and put it on one of his albums - so it's been done before.' 

Swift reportedly spent nearly ten hours inside Electric Lady Studio this week, arriving shortly after 8pm on Monday night and departing around 6am the next morning.

And it is possible, according to our source, that the pop sensation has not stopped at a one-off wedding single. 

'There has been talk that she will record an entire wedding album, but that is a lot, who knows,' our source said.

'Taylor writes really fast, though, and she has a zillion ideas, so it would not be hard for her.' 

Rumors about the exacts details of Swift's nuptials with Kelce, 36, have run wild since the Kansas City Chiefs tight-end popped the question last year. 

The Daily Mail has recently reported that a blockbuster bash is anticipated at New York City's Madison Square Garden on July 3, though other insiders have also suggested that a smaller ceremony will first , where Swift owns a coastal mansion.

The rumored New York plan may yet turn out to be a red herring meant to distract from a more intimate celebration, one insider said, though there is still high expectation of 'something [else] associated with MSG.'

But will Swift herself take the stage at the iconic arena?

'People are anticipating performances at the wedding from some of her famous friends and there's been some speculation of her performing as well,' another source said.

'She's always writing and recording, but if she were writing a song for Travis, that's not something she'd share with a lot of people. That's just not her style.'

The A-list couple have gone to great lengths to conceal the details of their big day, and sources have previously said guests have been required to sign NDAs before being privy to any information. 

But with the wedding said to be happening any day now, all eager eyes are on Swift and Kelce's every move.

This week, attention has turned to their respective bachelor and bachelorette parties.

Kelce, for his part, was spotted partying with friends and his brother Jason at Bird Streets Club in Los Angeles on Wednesday night, per Page Six. 

Across the country on the same evening, seemed to be buzzing with activity, with reports of people on the property and increased security.

According to TMZ, a woman who appeared to be Swift's childhood best friend, Abigail Anderson Berard, was seen on a lower balcony holding a child, and four women - three in black robes and one in white - were seen on a rooftop balcony.

Despite all the chatter, a third source told us that the bride-to-be has been incredibly calm ahead of saying 'I do.'

'She doesn't seem stressed about the wedding or details at all,' the source said, noting Kelce has been similarly mellow. 'She's been relaxed leading up to it and it's all been business as usual.'