When they're feeling extra lovey-dovey, celebrity couples hit the recording studio together. It's like a rite of passage for Hollywood's hottest musical pairs. But exactly how romantic are these infatuation-driven duets? From Jay Z and Beyonce to Sonny and Cher, we put 15 songs to the test, assigning each a "heart beats" rating that ranks romance factor on a scale of 1 to 10. Usher in Valentine's Day with these love songs, and chime in with your favorite celebrity-couple duets below.
Jay Z & Beyonce -- "'03 Bonnie & Clyde"
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Avril Lavigne & Chad Kroeger -- "Let Me Go"
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Sonny & Cher -- "I Got You Babe"
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John Mayer & Katy Perry -- "Who You Love"
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Bobby Brown & Whitney Houston -- "Something In Common"
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Jennifer Lopez & Marc Anthony -- "No Me Ames"
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Jessica Simpson & Nick Lachey -- "Where You Are"
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Faith Hill & Tim McGraw - "Let's Make Love"
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Swizz Beatz & Alicia Keys -- "International Party"
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John Mayer & Taylor Swift -- "Half of My Heart"
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Rihanna & Chris Brown -- "Nobody's Business"
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Stevie Nicks & Lindsey Buckingham -- "Frozen Love"
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James Taylor & Carly Simon -- "Devoted To You"
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Blake Shelton & Miranda Lambert -- "Over You"
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Ciara & Future -- "Anytime"
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Celebrity Couples' First Valentine
This post has been updated with additional information about the inspiration for "Over You."