Karina Smirnoff by Donato Sardella/ WireImage.com
underwent surgery this morning for her back, according to
. Her former dance partner,
, revealed that Smirnoff injured her back during the
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
- Anna Dimond