Floricienta (TV series 2004-2005)

Florencia Fazzarino is a poor girl but with a personality that's worth millions. She is funny, energetic and supersticious. In her early twenties she finds herself the new nanny of the fritzenwalden family, a german family of 5 orphan children. She is quickly accepted and loved by the whole family, as she brings happiness to them. The oldest one of the children, Federico, is in charge and his strict education and behavior soon crashes with flor's style, making her to call him 'Freezer'. He is also boyfriend of Delfina, who everyone calls the witch because of the mean things she does to everyone along side her mother Malala. Even though he is with Delfina, somehow Florencia's behavior and energy will make him 'melt down' over time making both of them (Flor and Fede) fall madly in love with each other. Malala and Delfina have an economic interest in Federico because when Delfina's father died, he left them with no chance of claiming the inheritance money, unless they find his misterious illegitimate daugther. Delfina's main target is Florencia, as she is a threat to her only chance of being rich again. - IMDb