Ashley Tisdale is celebrating her birthday in style by hitting the Hawaii beach in her bikini. We spotted her with boyfriend(?) Jared Murillo but what really caught our eye is the ring on her left hand.

I know it's her birthday and the ring doesn't look like the engagement type so what's going here? Is it a promise ring from Jared (The Tiz is only 23)? And isn't bad luck to wear a non-engagement/non-promise ring on your ring finger?