"Hello, Dolly." I'm going "out" now and will try to dredge up some more creative ways to properly address such regality.
Hello your royal Highness,Dolly you are a queen among bunnies,xx Rachel
You're lookin' swell, Dolly! I can tell, Dolly, you're still glowin'...you're still crowin'...you're still goin' strong.
Dolly, it is really nice to meet you.
Dolly, by golly, you're a beautiful bun!