Simplify the following text for a Grade 9 native English-speaking person.
Original: One of the the wealthiest communities in the United States , Montecito occupies the eastern portion of the coastal plain south of the Santa Ynez Mountains .
Simplified: Montecito is among the wealthiest communities in the United States and is home to many celebrities . It is east of , and directly adjacent to the city of Santa Barbara , occupying the eastern portion of the coastal plain south of the Santa Ynez Mountains .