Christina Aguilera's boobs are starring in a new music video! Umm … we mean -- Christina Aguilera is starring in a new music video! The sultry singer is lending her pipes (and her bod) to Mexican singer Alejandro Fernandez's sexy new Spanish music video, "Hoy Tengo Ganas De Ti."

In the video, Xtina, is standing next a balcony, wind blowing her platinum hair, wearing nothing but a bra and tight skirt, while belting her heart out. Then there is a lot of writhing on furniture, passionate embracing and intense singing. That's just what we call Tuesday afternoon at the office, here at X17!

"Hoy Tengo Ganas De Ti," which translates to "Today I Want You," is a cover of a 1975 Spanish hit by Miguel Gallardo and has reached number one in Mexico and number five in Spain. Alejandro talked about collaborating with the worldwide songstress, saying, "Christina has an amazing voice, sweet but also very powerful and full of feeling. I am very happy and proud with the result."

Alejandro and the mom-of-one originally recorded the duet for the hit telenovela La tempestad. The emotional song is about a man who confesses his love to a woman who is about to leave him. We're hoping that whenever she does, she decides to put her top on.