By People Staff
Updated June 23, 2011 05:00 PM
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Gary Hershorn/Reuters/Landov

Florence and the Machine’s Florence Welch celebrated Nylon magazine’s music issue at the Mondrian SoHo. The singer enjoyed a private dinner in the Penthouse, while downstairs at new nightspot Mister H, guests including Kellan Lutz, Ashlee Simpson‘s new interest Vincent Piazza and Portia de Rossi partied the night away.