John Mayer expressed interest in collaborating with Taylor Swift on Twitter in 2009.

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They released the song "Half of My Heart" eight months later on Mayer's album.

Mayer praised Swift during press tours, calling her a talented and genuine star.

They performed the song together at the Z100 Jingle Ball, sparking dating rumors.

A month later, they were seen having dinner together in Nashville.

They were also spotted together at the taping of CMT's Crossroads.

Swift had recently broken up with Taylor Lautner at the time.

The true nature of their relationship was never confirmed.

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