Ah, young love. So sweet. So pure. So inspirational? That, at least, was the case for one teen heartthrob who took a cue from his real-life love when writing a song that went on to be a roaring success.

The year is 2006 and the muse in question in Katie Cassidy, at the time an up-and-coming actress with a famous father and only a handful of credits to her name. She’s still a year out from making her debut on Supernatural and her time on Melrose Place and Gossip Girl is still far in the future.

In fact, the now 27-year-old star was then best known for accomplishments in her love life rather than onscreen. In 2006, she was dating one of music’s hottest stars and he was so crazy in love with Katie that he wrote her a song!

We gave Viggle LIVE! users three options for Katie’s musical Romeo: Teddy Geiger, Jesse McCartney, and Ryan Cabrera. Which man’s hairdo musical prowess won out? That be Jesse with 65 percent of the vote. Ryan came in second with 26 percent and Teddy took a distant third at 9 percent.

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But was Jesse the right choice when it came to Katie’s one-time beau? You bet your backup supplies of hair gel he was!

At the time Jesse wrote the hit “Tell Her,” he and Katie were going steady, only to eventually part ways after four years together. Of course, heartbreak didn’t derail their professional ambitions with Jesse still making sweet music and Katie starring as Laurel Lance in new series Arrow all these years later.

Always the one to ace pop culture trivia rounds? Watch more TV than seems humanly possible? Then today’s your lucky day! Just download the Viggle app, keep enjoying all things entertainment, and check into Viggle LIVE to earn points and win cool prizes!

Elisabeth Kramer is an Assistant Editor at Wetpaint Entertainment and our resident Downton Abbey expert. Follow her on Twitter and Google+!