Mariah Carey On Whitney Houston's Death: "It's Very Heavy Emotionally"

Mariah Carey is still emotional over the loss of her friend Whitney Houston.

The 42-year-old songstress stopped by Good Morning America to discuss her memories of Houston. The mama of twins said:

"I'm almost incapable of talking about this still. It's very heavy emotionally. I loved her. We all loved her. May she rest in peace... her legend's gonna go on forever."

Carey and Houston teamed up for the 2007 song "When You Believe." When asked about the collaboration, Nick Cannon's wifey added:

"It was great and I don't think people could ever understand our relationship. There was always this supposed rivalry in the beginning and then we did the duet and we became friends."

Click thru to see one of Whitney and Mariah's most memorable performances together.