This series manages to have a busty contestant show up from time to time, but not terribly frequently so I didn't find a single thread devoted to it and figured I'd start one.
Reason being the recent episode with bubbly, blonde, stuffed-into-a-tight-pink-dress contestant Trish (like fish!). She's definitely busty and her "talent" is basically speaking really really fast, which she tried to pass off as "rapping" though clearly she was just there to have fun and make an appearance on national TV (and I guess hug Howard Stern). The episode is available on Hulu, and the short segment with just her performance is trending high on the "popular clips" section...I won't link to it here though, because of possible issues with the other clips you'll find there.
However, Trish has a YouTube channel under the moniker "blndsundoll4mj" and you can find a 13-min video of her talking about the AGT appearance here:
www.youtube.com/v/rFIWum-zwWEHer voice is a bit squeaky and somehow she maintains a chirpy, peppy demeanor in all her videos, but she posts them frequently and often shows some nice cleavage, so check out her channel if you're so inclined.