Matt Sayles, Invision/AP
The lyric in question? Nathanson sings in his song: "and I'll forget about you long enough to forget why I need to." And Taylor's song lyric is: "and I forget about you long enough to forget why I needed to."
In a series of tweets that have since been deleted, Nathanson voiced his anger, writing: "she's definitely a fan... and now she's a thief." Days later, he tweeted: "so far, my favorite thing about today is the wave of @taylorswift13 fans calling me a prick on twitter for writing "i saw" in 2003."
Swift has shown that she's a fan of the 39-year old singer before: More than once on her last Speak Now tour, she wrote lyrics down her arm from Nathanson's songs.
The lyric could've just been an honest coincidence, as other songs in the musical world have shared similar lyrics before. Nathanson's 2007 song "Still" and Better Than Ezra's 2001 song "A Lifetime" both share the same lyric, "you move like water."
A few weeks ago, One Direction got in similar heat when their new song "Live While You're Young" drew comparisons to the Clash's 1982 song, "Should I Stay or Should I Go." In that instance, the 1D boys explained that the similar sound was "kind of on purpose."
So far, Taylor's reps haven't commented.
Watch 'Is Taylor Stealing Lyrics' Video
Check Out Taylor's Past Flames in Our "Celebrities Who Have a Dating Type" Gallery
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