Supercross announcer Erin Bates gets a chest-casting for charity - Follow the jump to watch the video

If you've followed Supercross over the last few years, chances are you're familiar with Erin Bates and Ashley Phillips. The attractive announcing duo recently partnered with Troy Lee Designs and the Keep A Breast foundation to give the world a chance to bid on their boobs (well, reasonable facsimiles, at least). It's all for a good cause, natch.

Bates and Phillips agreed to have life-sized casts made of their feminine assets, one layer at a time. These were then painted by the gang at Troy Lee Designs. The resulting works, as seen on the right, were auctioned off earlier this week in an effort to help boost breast cancer awareness and promote prevention, early detection, and support for those afflicted.

Now, while you can no longer bid on these particular breasts, you can watch how they were made. Click past the break to view the Troy Lee Designs-produced "making of" video of Ashley and Erin's casting sessions.

[Source: YouTube]