Famous for her bright latex outfits and funky songs, Katy Perry chose to sing a soulful acoustic in her guesting on X Factor. She sang "The One That Got Away" not like the original but in toned down mellow, only accompanied by guitars.

Perry spared her usual outfits on stage and opted to wear a simple white top with black pants suit. Her hair was unusually colored candy pink, not too much of a surprise since the singer has changed her hair color shifting from black to blue to pink.

The singer was in London for her "California Dreams" tour. She said to host O'Leary after her performance that she just wrapped up the 95th show in the O2 arena.

"I love coming to London so I can have baked beans on toast. They do bloat me and I'm afraid I'm going to go off like a firework, but I do love them," the singer revealed in her interview with The Sun.

"FINALLY! Beloved ENGLAND! 1st thing I did was stuff me gob (my mouth) w/some yorkshire puddings & meat pies from Silversmiths in Sheffield. Ah bless...See you soon...if I can stop eating these Yorkshires," she tweeted last week on her Twitter account.

"Yes, proper beans on toast... I've missed you," She later on added

Although toned down in clothes and in melody, the singer still stands out with her pink colored hair. See more of Katy Perry's hair evolution over the years.

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