Christina Aguilera recently kicked off her international "Liberation Tour." For last night's sold out performance at Radio City Music Hall in New York City, the "Telepathy" songstress spared no expense pulling out all the stops for the thousands of fans in attendance, including former President Bill Clinton and his wife, Hillary. 

According to E! Online, Christina started the night with a rendition of one of the newer songs from her sixth studio album Liberation, "Maria." Over the course of the concert, Christina revealed a set list filled with her earlier hits such as "Dirrty," "Genie in a Bottle," "Ain't No Other Man," "Beautiful," and "Can't Hold Us Down." The full range of Aguilera's talent was on display with the vocalist delivering stellar performances of her original songs, medleys, and covers of classics such as "It's a Man's Man's Man's World."

The crowd was also treated to surprise guest appearances, including one from the Queen Bee herself, Lil' Kim. During a performance of the famed early 2000's single, "Lady Marmalade," Aguilera announced to the crowd, "We got a surprise: Lil' Kim, Lil' Kim, Lil' Kim!" As the crowd erupted in cheers, Lil' Kim made her way to the stage. Dressed in one of her signature catsuits, the hip-hop veteran, and her "Lady Marmalade" collaborator put on an impressive performance.

Catch a few clips from the tour below.