Karina Smirnoff by Donato Sardella/ WireImage.com
Karina Smirnoff underwent surgery this morning for her back, according to Extra. Her former dance partner, Mario Lopez, revealed that Smirnoff injured her back during the Dancing tour, but apparently kept it hush-hush.

Despite the surgery, there's no need to worry that she'll be kept from the dance floor for long: She's expected to be back in the rhythm of things in time for this season's March 17 premiere, alongside her new partner, R&B crooner Mario. - Anna Dimond