Image Credit: Kevin Mazur/Wireimage.comIf you watched the Video Music Awards, there’s a good chance Florence + Machine’s stellar performance might still be lingering in your mind. Well you and everybody else. Following her appearance at the VMAs over the weekend, her debut album Lungs soared to No. 2 on the iTunes album chart, and the single “Dog Days Are Over” jumped from No. 105 to claim the No. 9 spot on the overall singles chart. Need more proof that she’ll soon be taking America by storm? Post-VMAs she was the No. 1 search on Google, and over in the Twitterverse the band received 1.7 thousand tweets per minute. And such is life for Florence Welch.

“It was so surreal,” singer Florence Welch told us when we caught up with her at SIRIUS satellite radio’s New York offices, where she was taping a performance for The Spectrum a few days after the VMAs. “I couldn’t believe I was living in post-VMA time frame. It honestly felt like I was going to be about to play the VMAs forever.” Next on the British-born star’s agenda is a U.S. tour, followed by recording her second album, due sometime in 2011.

With a guitarist and harpist at her side, Welch belted out “Rabbit Heart (Raise It Up),” “Cosmic Love,” and “Dog Days Are Over” to a small group of people in the SIRIUS studio. Check out this video of her performance after the jump. Welch’s segment will air Monday at 4 p.m. (ET) on SIRIUS channel 18 and XM channel 45.