It's been quite a busy summer for
According to Spears' Web site, Sparks will be joining previously announced acts Kristinia DeBarge as well as Girlicious and One Call.
"Britney's show is incredible and for me to be a part of it is a great opportunity," Sparks said in a statement.
Last week, Britney released the first official footage from her tour. The video, shot when Britney was in her brunette phase earlier this summer, features the opening sequence, in which gossip blogger Perez Hilton introduces the tour's ringmaster: Spears herself. Then, as the screen lifts, Britney descends from the ceiling dressed in her ringmaster jacket, hot pants and knee-high boots, whip in hand, and performs the tour's title track, "Circus."
Last month Spears revealed the new twists fans can expect when the tour starts up again. "We have a song called 'Mannequin' that we're adding to the show, which I'm really, really excited about, so it should be interesting," she said. "We have to update [the show] or it gets really boring."