After last night's Dolce & Gabbana event, it's safe to say that New York's fashion circuit has officially come down with a new case of Bieber fever. The adorable pop star, along with Scooter Braun, celebrated Fashion's Night Out by playing host at what proved to be one of the most talked about events of the evening.

Bieber and Braun were joined by a star-studded event committee of celebrity duos, including the likes of Ingrid Vandebosch and Jeff Gordon, Thierry Henry and Tyson Beckford, Kelly Rutherford and Matthew Settle, Erica and L.A. Reid, and Lauren Santo Domingo and Tatiana Santo Domingo.

The party, which celebrated the pre-launch of the brand's Passion Duo lipstick, featured music by DJ Ruckus and Hannah Bronfman, a special performance by Asher Roth, and refreshments by Martini & Rossi and Voss Water.

While Beiber was busy signing purchases, and while celebrity photographer Roxanne Lowit was busy shooting portraits for Dolce & Gabbana's personalized printed T-shirts, celebrities mingled amongst the crowd.

In attendance were Lala and Carmelo Anthony, Sophia Bush, Katie Couric, Chace Crawford, Brooklyn Decker, Karen Elson, Ellie Goulding, Ice-T, Dayssi Kanovas, Rose McGowan, Usher Raymond, Leann Rimes and Eddie Cibrian, Coralie Charriol Paul, Julia Restoin Roitfeld, Marina Rust, Bee Shaffer, Tabitha Simmons, Anna Wintour, and Stephanie Winston Wolkoff.