Welcome to the "Nightline's" live blog, where the staff share interesting tidbits throughout the day.

7:04 p.m. ET:  One of the Colombian escorts at the center of the Secret Service scandal emerged from hiding today, recounting in detail her night in Cartagena with a member of President Obama's protective detail and saying she fears for her safety.

2:39 p.m. ET: Beastie Boys member Adam Yauch dead at 47. #RIPMCA is already one of the top trends on Twitter.

12:26 p.m. ET: The Johnston family, from Barnesville, Ga., calls themselves the "real life seven dwarfs." They are the largest family of  achondroplasia dwarfs, with a type of dwarfism that affects the extremities.

Credit: Courtesy The Johnston Family

Watch Barbara Walters' interview with them on "20/20? tonight.

10:21 a.m. ET: It's going to be a real super weekend. Not just talking about "The Avengers," but a massive "super moon" is expected to rise on Saturday night. ABC's Ned Potter has more.

Credit: Bill Ingalls/NASA via Getty Images

8:04 a.m. ET: Marvel comics fans, your wait is finally over. The hotly-anticipated blockbuster film, "The Avengers," opens tonight. ABC's Chris Connelly sat down with the entire cast, sans Robert Downey, Jr., to talk about working together and having fun both on and off set.

ScarJo revealed that her stunts "shredded" her Black Widow costume and she sang her favorite karaoke song, the Beatles' " Rocky Raccoon," at a dive bar in Cleveland.