Taylor Swift paid respect to fellow Pennsylvania native Pink, performing the pop singer's No. 1 hit, 'Who Knew,' for her hometown crowd during the Philadelphia tour stop of her sold-out Speak Now World Tour.

Although she solely wrote every song on her multi-platinum 'Speak Now' album, the country superstar has sprinkled in a few choice covers throughout her latest tour. Previous surprise performances by Taylor include Eminem's 'Lose Yourself,' Justin Bieber's 'Baby' and the Dixie Chicks' classic, 'Cowboy Take Me Away.'

Watch Taylor cover 'Who Knew,' along with TLC's 'Unpretty,' below.

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