Dianna Agron softens up the red carpet in a lovely J. Mendel dress at the 2011 Golden Globe Awards held at the Beverly Hilton Hotel in Beverly Hills on Sunday afternoon (January 16).

The 24-year-old Glee starlet accessorized her look with a Ferragamo clutch and Cathy Waterman jewelry. Beau Alex Pettyfer also suited up in Armani for the award ceremony.

The twosome’s new flick, I Am Number Four, hits theaters next month on February 18th! Stay tuned to JJJ for our interview with Alex and Callan McAuliffe!

15+ pics inside…