Lil Kim Joins Christina Aguilera at 'Liberation Tour' in NYC!

Christina Aguilera‘s Liberation Tour just keeps getting better!

The 37-year-old Lotus pop icon brought her concert to Radio City Music Hall on Wednesday night (October 3) in New York City.

PHOTOS: Check out the latest pics of Christina Aguilera

During the show, which included performances of tracks like “Accelerate,” “Genie in a Bottle” and “Dirrty,” Lil Kim surprised the crowd with a rendition of their classic Moulin Rouge smash “Lady Marmalade.”

Later on, A Great Big World joined Christina for “Say Something.”

Bill and Hillary Clinton were also in attendance at the star-studded show.

50+ pictures inside from the Liberation Tour in NYC…