Christina Aguilera pulled out all the stops last night.

Political power couple Bill Clinton and Hillary Clinton were in the audience when the award-winning singer's Liberation Tour hit Radio City Music Hall in New York City, joining thousands of fans at the sold-out show. Aguilera kicked things off with "Maria," off her sixth studio album Liberation, before going back in the archives and segueing into "Genie in a Bottle" and "Dirrty."

Styled by Karen Clarkson, Aguilera modeled fashion-forward designs by Milligan Beaumont, Joshua Kim and Gareth Pugh as she whipped through hits like "Accelerate," "Ain't No Other Man," "Beautiful," "Can't Hold Us Down" "Express" and "Fall in Line." There were medleys ("Elastic Love," "Woohoo" and "Bionic") and covers ("It's a Man's Man's Man's World"), but perhaps the biggest surprises of the night came from the performers who joined her onstage.

Lil' Kim, Christina Aguilera, The Liberation Tour

Kevin Mazur/Getty Images for Live Nation

After singing the first verse and chorus of her No. 1 hit "Lady Marmalade," Aguilera told fans, "We got a surprise: Lil' Kim, Lil' Kim, Lil' Kim!" As the crowd's cheers reached near deafening levels, the diminutive diva strutted onstage, with swagger to spare, in a skintight catsuit. The show-stopping set ended with a huge hug and Aguilera telling her friend, "Thank you so much!"

But the once-in-a-lifetime moments didn't end there.

A Great Big World, Christina Aguilera, The Liberation Tour

Kevin Mazur/Getty Images for Live Nation

Later in the show, Aguilera brought out A Great Big World to sing their Grammy-winning duet "Say Something." Veiled behind a video screen, frontman Ian Axel played piano and sang his verses with gusto on an elevated platform, as Aguilera belted her heart out on the stairs below.

Christina Aguilera, The Liberation Tour

Kevin Mazur/Getty Images for Live Nation

After closing the show with "Fighter," fans went wild—so Aguilera returned onstage for an encore. Emerging in a wedding dress, she sang "Unless It's With You" and helped facilitate yet another marriage proposal—a tradition she started when the tour launched Sept. 25 in Florida.

Carmen Carrera, The Liberation Tour

Kevin Mazur/Getty Images for Live Nation

Aguilera decided to say farewell with a giant dance party, singing "Let There Be Love" and bringing out Carmen Carrera (of RuPaul's Drag Race fame) to really rev up the room. "I just want to say that I'm, like, living for myself, because I was onstage at Radio City Music Hall with Christina Aguilera—and my name was on the screen," Carrera said later. "It was a big moment!"

The Liberation Tour will return to Radio City Music Hall tonight.

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