While performing in London over the weekend (Friday, 22nd of June), Taylor welcomed to the stage NIALL FREAKING HORAN.
The two performed Niall's hit song "Slow Hands" together, and it was epic.
Both Niall and Taylor later shared some BTS shots of them rehearsing together.
"thank you @taylorswift for having me last night at Wembley . What a fantastic experience to share the stage with you! ❤️," wrote Niall.