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Sneak peek: Katy Perry on 'How I Met Your Mother'

Look away, Elmo! Katy Perry’s bringing her not-safe-for-“Sesame Street” plunging necklines to “How I Met Your Mother.”In the next episode of the CBS comedy, the cleavage-baring “Teenage Dream” singer plays Zoey’s beautiful but not so bright cousin, Honey. For Barney and Ted, that means headaches and heartbreaks are on the way.Perry’s “How I Met Your Mother” appearance airs F

Look away, Elmo! Katy Perry’s bringing her not-safe-for-“Sesame Street” plunging necklines to “How I Met Your Mother.”

In the next episode of the CBS comedy, the cleavage-baring “Teenage Dream” singer plays Zoey’s beautiful but not so bright cousin, Honey. For Barney and Ted, that means headaches and heartbreaks are on the way.

Perry’s “How I Met Your Mother” appearance airs Feb. 7 at 8 p.m. ET.