Christina Aguilera Shines on Stage with Surprise Pride Performance Partner Adam Lambert.

Christina Aguilera and Adam Lambert performed a powerful rendition of "Lady Marmalade" at the Pride Island festival in New York City to celebrate Pride Month. Lambert joined Aguilera on stage and the two belted their hearts out while shimmying to the rhythm. Lambert later gushed over Aguilera's talent and inspiration to him as a vocalist on his Instagram page. This performance came after Lambert sang "The Muffin Man" in a super accurate Cher voice on That's My Jam in April.