Katy Perry slipped into a black bikini to lounge poolside at Miami's SOHO Beach House today. She was reading the latest issue of BlackBook Magazine, which features her friend Robert Pattinson on the cover. Katy, who is friends with both Rob and Kristen Stewart, has been spotted spending time together with the couple this Spring and Summer, though she is not one of the celebrities who have weighed in on the Kristen Stewart cheating scandal.

Katy has been enjoying a break since promoting her 3D film Katy Perry: Part of Me earlier this Summer. The film didn't draw in big bucks at the box office, but it was relatively cheap to make. Katy nonetheless took home the choice summer movie surfboard at Sunday's Teen Choice Awards. It also seems Katy may have some news in the romance department. It's rumored that Katy Perry's dating John Mayer. The pair were reportedly spotted on a date at LA's Soho House last week, though neither star has addressed the stories publicly.

Demi Lovato and Britney Spears, escorted by Britney's fiancé, Jason Trawick, made their way out of a Miami hotel earlier today. Britney, Demi, and their fellow X Factor judges Simon Cowell and LA Reid arrived in Florida earlier this week for the final leg of live auditions. The foursome are putting the contestants through a rigorous boot camp before narrowing the field down to just 32 finalists.

Apparently Simon Cowell wants the season-two hopefuls to relax during their stay and upgraded all of them to rooms at South Beach's Mondrian hotel. The entire judging panel teleconferenced into Fox's TCA presentation on Monday, where Simon revealed "Britney's as sweet as a lemon" and Spears confessed she's not holding back and said, "In everyday life I'm just an honest person." Be sure to set your DVR for the show's Sept. 12 premiere, and check out our entire calendar of Fall premiere dates.

Victoria Beckham and David Beckham lunched with their 1-year-old daughter Harper Beckham at 202 restaurant in London today. Victoria wore one of her own designs, a short dress with swan details on the collar. The trio headed out to their car in Notting Hill after what's been an already busy day for David. He arrived in the UK after a short stint in Philadelphia, where he played a game with the MLS All-Stars team. He was then off for a quick meeting at the prime minister's residence, 10 Downing Street, to discuss British efforts to combat global child malnutrition in association with UNICEF. While David traveled back to the States, Victoria stayed put in Europe. She did, though, take a quick jaunt to Ireland to show off her Victoria Beckham Collection designs at a Dublin store. Harper went along, too, and showed off her walking skills to the delight of the Victoria fans in attendance. Another of David and Victoria's children, Romeo, went along with Posh to Paris for a day trip this week. The whole Beckham clan is looking forward to an exciting Olympics, and the fun will start tonight, at least for David, at a charity party with Brad Pitt and Angelina Jolie at the Victoria and Albert Museum.

Happy birthday to Sandra Bullock, who turns 48 today! She's one of Hollywood's hottest stars and has been lighting up the screen for over two decades. Along the way, Sandra's made many friends and worked with some major names, including Ryan Gosling, Keanu Reeves, Ryan Reynolds, and Hugh Grant. Click through to see some of her happiest moments, and happy birthday, Sandra!

Prince William and Kate Middleton made their second appearance with Prince Harry in London today. They looked on as John Hulse, who is part of the Ogwen Valley Mountain Rescue Organisation, carried the Olympic torch at Buckingham Palace after Prince Charles and Camilla watched a ceremony with the flame just yesterday. Prince William reportedly requested that a rescuer take the torch in England and John said of the task, "I'm greatly honored to be asked to carry the torch on behalf of Mountain Rescue England and Wales."

Earlier today, William, Kate, and Harry got a sporty head start on the Olympics fun when they attended the launch of the Coach Core program at Bacon's College. It's just the beginning of a long string of appearances for the royals, who are expected to attend nearly 30 events during the Summer Games, which officially kick off with opening ceremonies tomorrow.