The newest patch level is 1.33. Incidentally, there were a few bugs in Patches 1.31 and 1.32 (the other two you've missed).
The info for patch 1.33:
This game update includes the following changes:
Some art updates
Stability improvements
Sims saved with game update 1.32 that exhibit overly dark textures can be restored to normal by editing the Sims in Create a Sim
The info for patch 1.32:
This game update includes the following changes:
Prevention of any custom, user-created content from being installed in the host’s game when using SimPort.
Capability to remove any files associated with a visiting Sim during a SimPort experience so they are not saved to a player’s system permanently.
The info for patch 1.31:
This game update includes the following changes:
Exciting new connected features which allow you to:
Post and view messages from your friends while playing, without having to leave or even pause the game.
Find new friends and add them to your friends list.
Access your Player Profile and Wall from the Options Menu
Receive status updates from your friends about their game, and comment!
Achievements—view the badges you’ve earned for those you’ve completed, sort and view those you have yet to complete, and find new achievements, which will be introduced to your game regularly!
Edit and view your Player Profile, including your avatar, My Story, and wall posts all about you!
Get all of the latest and exciting news from The Sims 3!
You can now specify what outfit your Sim will wear to work by using a dresser.
When a Service NPC joins the family, their special service outfit is added to the wardrobe.