Canon Rebel Digital Camera Sigma 35mm SLR Compatible With Canon Digital Rebel Camera?

Sigma 35mm SLR compatible with Canon Digital Rebel camera? - canon rebel digital camera

Hello
I have the Sigma UC Zoom 28-105mm F4-5.6 for 35-mm SLR cameras.
Is it working on my new Canon Rebel XSi (450D) digital SLR camera?

Thank you!