There was plenty of speculation about the rock on Miley Cyrus' finger when she stepped out with boyfriend Liam Hemsworth Saturday for Muhummad Ali's 70th birthday celebration in Phoenix.

Miley silenced the rumors Monday morning by tweeting, "I'm not engaged.

I've worn this same ring on this finger since November! People just wanna find something to tal about! It's a topaz people!"

Cyrus and Hemsworth have been dating for three years.