Christina Aguilera and Cher attended the premiere of their film 'Burlesque' on Monday at Hollywood's Grauman's Chinese Theater. Aguilera wore an Elie Saab emerald green empire waist silk chiffon gown and Neil Lane jewels. Cher, 64, debuted a more risque outfit -- stepping onto the red carpet in a sparkly black dress with a plunging neckline, very high hemline and lacy bra.

In the film, Aguilera plays a small-town girl who ventures to Los Angeles and finds her place in a neo-burlesque club run by a former dancer played by Cher.

Earlier in the day, Aguilera received a star on the Hollywood Walk of Fame. Some 1,000 fans jammed a Hollywood Boulevard sidewalk to watch, and gushed with delight as the star was unveiled in front of the Hard Rock Cafe.

"Oh my goodness! How amazing it is to see all of your fabulous faces. This is a huge staple in my life. Thank you all from the bottom of my heart," the 29-year-old pop diva said.