The store is located in the 8500 block of Van Nuys Boulevard.
It features clothes with the singer's initials, J-R, an exclusive line of Jenni jeans, and Jenni Rivera perfume. All of her albums are also available at the boutique.
Hundreds of fans lined up outside the store in anticipation.
The singer, businesswoman and actress was among seven people who died in a plane crash shortly after takeoff in northern Mexico last December.
The jet was built in 1969 and records show it sustained substantial damage in an accident in 2005 when it experienced a fuel system malfunction. Air traffic controllers lost contact with the U.S.-registered Learjet 25 about 10 minutes after takeoff.
The plane plunged more than 28,000 feet in a nose dive, disintegrated on impact and much of the wreckage was immediately recognizable.
