On Friday, 16-year-old Lauren Alaina got the chance of a lifetime ... You know, other than coming in second on 'American Idol.' The 'Like My Mother Does' songstress was given the honor of performing the national anthem at the Boston Red Sox Game! Like a good pal, she took fellow 'Idol'-ists Pia Toscano and Scotty McCreery along, and Pia tweeted a Twitpic to prove it. Also this week, Justin Bieber went 'mountain' climbing and tweeted a picture of his feat, Christina Perri Twitpiced her beach trip, and Ray J shared a photo of his new 'do. See what awesome pictures the pop stars tweeted this week!