Crystal Bowersox

Mind the gap? Apparently, she did.

American Idol runner-up Crystal Bowersox — distinctive for her dreadlocks and gap-toothed smile — is showing off some improved pearly whites in time for the show's tour.

American Idols Live! tour sings the blues — cuts 8 dates

The 24-year-old singer, who finished second this year to Lee DeWyze, tweeted a picture of herself smiling Thursday. The caption: "What's NOT missing in this picture?????? Yeah. That's right."

American Idols Live! began this week and runs until Aug. 31.