Taylor Swift cheekily branded BFF Ryan Reynolds a ‘sperm donor’ as she hopped on the promo trail for his new film, Deadpool & Wolverine.

The singer, 34, who has been best friends with Reynolds, 47, and his wife Blake Lively, 36, for years, took to Instagram to give the upcoming film a rave review and post a snap with her pals, Wolverine actor Hugh Jackman, 55 and director Shawn Levy, 56.

She also revealed she was the godmother to the couple’s four children in the fun post.

She wrote: ‘Over the past few years I have watched one of my best friends on this planet pour every bit of his heart, soul, sweat, time, energy, jokes, pain, joy, rebellion, darkness, and magic into this film.

‘He’s created the best work of his life, and this film feels like an actual joy portal, a wild escape from reality, and an abs sandwich. I don’t know how he did it.

‘But that’s just Hugh for you!’ she quipped.

‘These other randoms crashed the photo and we were too polite to ask them to leave.

‘Deadpool and Wolverine is out TOMORROW! Here’s where to buy tickets if you like things that are unspeakably awesome. Shout out to Wade Wilson, aka my godkids’ sperm donor!’

This comes as Swift fans are convinced that the pop star is ‘secretly engaged’ to her partner Travis Kelce.

It comes after the Cruel Summer songstress played a ‘cryptic’ surprise song at the Eras Tour in Gelsenkirchen, Germany, on Friday night.

The third and final night in the city saw her perform a mash up of ‘Stay, Stay, Stay’ and ‘Paper Rings’ on guitar.

Paper Rings from her 2019 Lover album features lyrics such as ‘I like shiny things, but I’d marry you with paper rings’ and ‘darling, you’re the one I want’.

While it was written when she was in a relationship with her ex Joe Alwyn, fans are claiming that she chose to the sing the song as she might be engaged to NFL star, 34.

Back in June Travis shocked fans as he joined Taylor onstage at her sold-out Wembley show.

It is the first time the pair have taken to the stage together, after officially announcing their relationship on Instagram that week.

American footballer joined Taylor onstage for a costume change before the song I Can Do It With a Broken Heart – sending fans into a frenzy once again.

The athlete was dressed up in a white bow tie, tailcoat and top hat.

He picked Taylor up, fanned her and powdered her face as part of the act.

Before Taylor carried on with her performance, she made sure to blow a kiss to her NFL beau.