Christina Aguilera surprises Hayden Panettiere on 'Lip Sync Battle'

Christina Aguilera Brings Back "Lady Marmalade"

Does it feel like 2001 all over again, or is that just us?

In a preview clip released Monday teasing Thursday's episode of "Lip Sync Battle," Hayden Panettiere is shown channeling Christina Aguilera in the 2001 burlesque-themed music video for "Lady Marmalade."

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Aguilera famously remade the iconic tune with Pink, Lil' Kim, Mya and Missy Elliott for "Moulin Rouge," the film that scored Nicole Kidman an Oscar.

See photos of Christina Aguilera from over the years:
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Christina Aguilera through the years
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Christina Aguilera surprises Hayden Panettiere on 'Lip Sync Battle'
THE VOICE -- 'Live Semis' Episode 817B -- Pictured: Christina Aguilera -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
Singer Christina Aguilera performs her hit song "Genie In A Bottle" accompanied by dancers at the 1999 Teen Choice Awards taping August 1 in Santa Monica. The award show, celebrating the hottest teen icons in film, television, music, sports and fashion was sponsored by Seventeen magazine and will be broadcast on the FOX television network in the United States on August 12. FSP/JP
Singers Britney Spears (L) and Christina Aguilera appear on stage at the MTV Video Music Awards in New York on September 7, 2000. Spears and Aguilera were both nominated for awards in the show. JC/SV
Singer Christina Aguilera, pictured June 2, 2001 at the 2001 MTV Movie Awards in Los Angeles, was nominated for two Latin Grammy awards, including Best Record of the Year for "Pero Me Acuerdo De Ti" ("But I remember you"), the Latin Recording Academy announced July 17 at a press conference in Miami. The awards will be presented September 11 during a ceremony at the American Airlines Arena in Miami. BK/HB
Singer Christina Aguilera poses as she arrives at the sixth annual "Teen People" 25 Hottest Stars under 25 party in Hollywood May 5, 2003. Aguilera was named to the list which features the top young stars in film, music and television. REUTERS/Fred Prouser FSP
Singer Christina Aguilera arrives at the 46th annual Grammy Awards show in Los Angeles, February 8, 2004. REUTERS/Fred Prouser FG/SV
Singer Christina Aguilera performs 'When You Wish Upon A Star' on stage at Disneyland's 50th anniversary celebration. Singer Christina Aguilera performs the Disney song 'When You Wish Upon A Star' at Disneyland's 50th anniversary celebration ceremony, at the Disneyland theme park in Anaheim, California May 5, 2005. Walt Disney, founder of the Walt Disney Company and visionary behind the creation of Disneyland, opened the park on July 17, 1955. REUTERS/Fred Prouser
Singer Christina Aguilera performs at the 2006 MTV Movie Awards taping at Sony Pictures Studios in Culver City, California June 3, 2006.
Christina Aguilera performs on ABC's Good Morning America in New York's Bryant Park August 18, 2006. REUTERS/Brendan McDermid (UNITED STATES)
Christina Aguilera holds her Grammy after winning Best Female Pop Vocal Performance for "Ain't No Other Man" at the 49th Annual Grammy Awards in Los Angeles February 11, 2007. REUTERS/Mike Blake (UNITED STATES)
Singer Christina Aguilera is interviewed as she arrives at the 'Africa Rising' Festival at the Royal Albert Hall, in London October 14, 2008. REUTERS/Alessia Pierdomenico (BRITAIN)
Singer Christina Aguilera arrives at the 2010 MTV Movie Awards in Los Angeles June 6, 2010. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)
Cast member Christina Aguilera waves at the premiere of "Burlesque" at the Grauman's Chinese theatre in Hollywood, California November 15, 2010. The movie opens in the U.S. on November 24. REUTERS/Mario Anzuoni(UNITED STATES - Tags: ENTERTAINMENT)
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Panettiere seems to have nailed X-tina's iconic "Marmalade" look and sexy, thrust-filled dance moves in her "Lip Sync" performance in which she's up against "Telenovela" star Eva Longoria. There's no indication of what song Longoria performs -- besides her '80s-style get-up -- but it Panettiere's true competition comes from Aguilera who makes a surprise appearance on stage with her.

Belting it out in her usual over-the-top Aguilera style, the "Voice" coach is wearing a black jacket and pants on top of a silver sparkling bra. In hand? Her signature red mic, of course.

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