The celebrity management firm currently works with Peter Andre and also represented Katie Price for over five years before her split from Andre.
Director of Can Associates Claire Powell said: "I'm delighted to be working with Amy, we intend to make her a huge success. We were instantly impressed with her down-to-earth nature and her determination to work hard.
"It's a very exciting time for Amy and we already have numerous fashion and beauty deals on the table - watch this space it's going to be a very busy time for her."
Childs added: "Since The Only Way Is Essex hit the screens it's been a total whirlwind. It's a very exciting time and I can't wait for Can Associates to oversee my future projects - I have admired their work for a long time - I'm thrilled!"
The reality TV star last month described Andre as "gorgeous" and claimed that she would be happy to date him. He replied that he was "flattered" but suggested he was too old for her.