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Actress Rosamund Pike is a confirmed 'Swiftie' after she was spotted 'shaking it off' at the superstar's concert in Cardiff.

The Saltburn star was seen in the crowd as popstar Taylor Swift continued the UK leg of her Era's Tour at the Principality Stadium in Cardiff, Wales, on Tuesday (18/6).

The 45-year-old is also famous for being in Die Another Day, Pride and Prejudice, Jonny English Reborn and Gone Girl.

In the footage, she can be seen in a white sparkly dress dancing alongside a number of friends to Swift's 'Shake It Off' in a reported VIP area of the stadium.

A fellow concert-goer who snapped the video said: "I had tickets on the pitch near the stage and they were in a VIP area just in front with small barriers around it."

"The stuff from the 1989 album is when she really started enjoying it and dancing a lot."

Reportedly also in the same area was Louis Rees-Zammit, 23, new teammate of Kansas City Chief's tight end and Taylor Swift's boyfriend, Travis Kelce.

The Welsh star who recently made the switch from rugby to American football was enjoying some downtime before the new season.