They starred in the hit movie
Cow Belles, which came out in 2006.
It's all about two sisters who are made to work in their family's business.
Aly Michalka also starred in
Phil Of The Future.
It's about a family from the year 2121 who are stuck in 2004, trying desperately to fit in.
It ran from 2004 to 2006, and also starred Brenda Song and Evan Peters.
Aly & AJ's music can be heard in many Disney Channel shows and movies.
The girls even featured on the
Very Best Of Disney Channel CD for their song
On The Ride.
Aly later went on to star in