Siobhan Magnus was arguably the most compelling contestant on "American Idol" Season 9, so it was only a matter of time before she came to the attention of her own personal idols, Hanson--and not just because she'd spoken glowingly about them in almost every one of her interviews (Hanson were her dream "Idol" mentors), or because she had a line from Hanson's song "The Great Divide" tattooed on her left wrist. Siobhan's individuality, talent, major pipes, and kooky sense of style also earned the band's respect; according to Taylor Hanson, it was an honor to be admired by "the cool one" from "Idol."

Taylor initially extended a personal invitation for Siobhan to join Hanson onstage via an interview with the L.A. Times' "Idol Tracker" column, but it wasn't until Wednesday, June 9, that she was able to take them up on their kind offer, when she happened to be in Los Angeles rehearsing for the Idols Live Tour and Hanson were in town for a secret midnight show at the intimate Hollywood nightclub Bardot. Siobhan ended up being Hanson's special surprise guest at that gig, and Reality Rocks was lucky enough to sneak into the "Siobhanson" rehearsals that fateful day, as Hanson and Siobhan instantly gelled and hashed out three of their songs in only a couple of takes. ("You should go on tour with us!" joked eldest brother Isaac, after hearing her belt out their ballad "Weird.") It was impressive to see how easily Siobhan fit in with the band's lineup, also harmonizing like a long-lost Hanson sister on "Been There Before" (a song Siobhan had actually referenced in a high school art project in her pre-"Idol" days) and the Sam & Dave cover "Hold On, I'm Coming--but then again, as she put it herself, as a longtime fan she'd been "practicing for 14 years." She was ready.

Later that night, the entity henceforth known as "Siobhanson" was officially born, as a giddy Siobhan happily hopped onstage to join the blonde brothers on the aforementioned songs plus the show-closing feelgood classic, "MMMBop." Afterwards, she actually declared the experience was "better than winning 'Idol.'" And I had to agree with her--she performed like a true champion, and it was a win-win situation for Hanson and all Bardot spectators as well.

Check out some adorable exclusive rehearsal footage, along with a post-practice, pre-show Bardot interview with Siobhan and the boys, below. Siobhanson for the win!

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