Whitney Houston hasn't hit a red carpet in an entire year -- but last night, she made a rare public appearance in Hollywood ... and even sang!

The diva was spotted at the Kelly Price & Friends Unplugged: For The Love Of R&B GRAMMY Party at Tru Hollywood with daughter Bobbi Kristina, looking great in a black cocktail dress.

She hit the red carpet before heading inside, where she briefly shared the mic with R&B singer Kelly Price.

So ... how did she sound?

Well, it's hard to hear over all the screaming, but the crowd seemed to like it!

Check out the performance below, plus all the Grammy Awards Pre-Party pics in the gallery above.

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