Celebritology 2.0: Scarlett Johansson

She and other celebrities filled in for Roker on the “Today” show because he has laryngitis.

Also in the morning mix: Ray J denies having knowledge of Whitney Houston’s drug use.

Also in the morning mix: Nicollette Sheridan has her day in court.

”Operation Hackerazzi” reportedly targeted the cell phones and e-mail accounts of high-profile celebrities.

In August, Michael C. Hall and Jennifer Carpenter arrive for the 62nd Primetime Emmy Awards in Los Angeles. (AP) On what may henceforth be known as "Terrible Tuesday," we may just have lost our ability to believe in long-lasting celebrity coupledom. First, "High School Musical" sweethearts Zac Efron and Vanessa Hudgens announced their break up after a relationship that saw them through the transition from teen idols to twenty-somethings. Then, on the same day we learned that "Dexter's" Michael C. Hall had separated from his on-screen foster sister, Jennifer Carpenter amidst rumors of an alleged affair between Hall and another "Dexter" co-star, Julia Stiles. (Stiles denies any involvement, it should be noted.) Carpenter officially filed for divorce on Thursday. But back to Tuesday. Before the day was out, GQ's Babe of the Year and People's Sexiest Man Alive -- Scarlett Johannsson and Ryan Reynolds -- announced an amicable split...

Ryan Reynolds. (AP) Scarlett Johannson and Ryan Reynolds -- aka GQ's Babe of the Year and People's Sexiest Man Alive -- have separated and plan to divorce. In a joint statement released Tuesday, the couple wrote: "After long and careful consideration on both our parts, we've decided to end our marriage. We entered our relationship with love and it's with love and kindness we leave it. While privacy isn't expected, it's certainly appreciated." A source told Us magazine that the couple, married since 2008, separated about two weeks ago and that Johansson initiated the split. "The big problem with their relationship is the distance," said Us's source. "They spent a lot of time apart when they are working... She's been unhappy for a while." Scarlett Johansson. (AP) Back in March the couple's marriage was rumored to be in trouble because the pair was rarely seen together. But an "insider"...