We have no idea what a "wango tango" is, but judging by KIIS FM's Wango Tango 2010 at the Staples Center, it's big: big enough to get Bieber, Usher, Kelly Rowland, Ke$ha, Ryan Seacrest and the Hoff into one room.

• Tito Ortiz was arrested on felony domestic violence charges today for allegedly beating Jenna Jameson at the home they live in with their 13-month-old twin boys.

• Last week, Katherine Heigl complained that "cruel and mean" Grey's Anatomy producers forced her to work a 17-hour day, but according to rumors, the schedule was the result of producers shuffling things around to let her promote The Ugly Truth.

• Mischa Barton's former friend Nicole Richie is helping her get her life back together after her recent meltdown. Nicole, "stepped in and talked to her about making changes in her life… basically doing a 360," says a source.

Last week, the tabloids were filled with breathless speculation over the demise of 16-year-old Miley Cyrus' relationship with her 20-year-old boyfriend, Justin Gaston, and her subsequent "reconnection" with Nick Jonas. Commenters took the opportunity to rip Miley to shreds.

• A rep for Chastity Bono—the child of Sonny and Cher—confirms that Bono is in the initial stages of transitioning from female to male.

• Miley Cyrus and Justin Gaston have split after less than a year together. A source says the breakup was a result of Miley's traveling, and not Nick Jonas, although he and Miley "have been spending time together." [Us]

• Chris Brown has publicly addressed the Rihanna assault for the first time in a short YouTube video. He says he's working on a new album, Grafitti, and he'll release a new single this summer. He says: "Everybody that's haters, they've just been haters..."

• Miley Cyrus wants to dump her boyfriend Justin Gaston, but her father doesn't approve:

• El oh el: It appears none of the celebrity weeklies have bought exclusive rights to pictures of Heidi Montag and Spencer Pratt's wedding this weekend.