First Name Basis

We are dealing a completely sassy 18 month old. Annabanana has taken to calling us by our first names! At first it was kind of funny, she would interject our names only once in awhile and we weren't sure if she knew who she was actually referring to. Well, now I know, she's just being impudent. She has quit using the more age-appropriate 'mama' and 'dada' to stricly calling us by Sarah and Karl. At 6am this morning, she hollered up to her daddy- "Karl, Karl, Karl!". I guess we're going to have to start calling each other Mom and Dad and have our friends refer to us that way too until she no longer thinks our names are Sarah and Karl. I expect this out of our naughty teenager, but she's only a toddler!