Rihanna, Shakira collaboration excites Instagram fans [PHOTO]: 'Can't Remember to Forget You' one-week countdown begins!

Rihanna has a new collaboration coming out next week featuring Shakira... and fans can't wait.

The song's called "Can't Remember to Forget You" - check it out:

badgalriri: "One. Week. Countdown."

Just last month, rapper Pitbull hinted that RiRi was "secretly" working with the Colombian songstress:

"That is an ironic situation there. The person we were looking at first to work on that record was actually Rihanna, and Rihanna had something she had to do with Shakira, so she wasn't able to work on our record," he told the popular radio show Kid Kraddick In The Morning.

Pitbull originally wanted the Barbadian beauty to sing the hook on his new song "Timber" - the part ultimately went to Ke$ha (who recently checked into rehab to help treat an eating disorder):

Several fans are uber excited about the release of this powerful collaboration - it should prove epic:

marianesafar: "Oh my God!!!!! Shakira and RiRi I'm sure it's gonna be great."

daniiel_fonseca: "I love it, it's perfect."

medusaface_: "Can't f*cking wait !!!! Yo go girl!"

hamidah_x: "Whoa! Yes lawwwwwwd!"

badnavyheaux_: "Can't wait anymore.. so excited."

Stay tuned for the "Can't Remember to Forget You" debut on January 13, Mstars readers!