The booking comes on the heels of Mitt Romney’s dominant performance in the first presidential debate on Wednesday. Romney will co-host the morning program alongside Robert’s co-anchor George Stephanopoulos and correspondents Lara Spencer, Josh Elliott and Sam Champion.

She joins previously announced pinch-hitters Stephen Colbert, Oprah Winfrey, the cast of Modern Family and Roberts’ ABC News colleagues Diane Sawyer, Katie Couric and Barbara Walters. Jessica Simpson co-hosted GMA on Sept. 11.