There is NO cheat on Sims 3 for bigger breasts. Once you buy the expansion pack "Sims 3 Latenight" you can adjust your sims breast size.
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No, there is no cheat code for skills on The Sims 3.
There is no cheat for Mcdonalds in the Sims 2 or 3
Unfortunately there is no Sims 3 cheat that maximises all skills...yet.
motherlode -Which is the cheat to get 50,000 -It works on Sims 3, for every pack