Although The X Factor canceled the open to the public boot-camp filming for reasons we’d love to know, there were plenty of opportunities to catch them in action. On Thursday, Britney Spears was seen sipping sugar-free Red Bull in between takes at the Mondrian. It was date night for Spears on Friday, spotted poolside at the Delano with fiancé Jason Trawick, looking, says our spy, “amazing in a tight lace dress.”

Spears’s co-judge, Demi Lovato, had lunch Thursday at Asia de Cuba at the Mondrian in between filming her scenes at the hotel, separately from Spears. Lovato’s group was overheard ordering sushi, ceviches and BBQ chicken. Lovato recharged with a double espresso before heading back to work.

On Thursday, judge/ music mogul L.A. Reid made a stop at the Shore Club to visit with contestants rehearsing in the rooftop penthouse. Many were overheard saying how “amazing” and “cool” Reid was.

Former NYC mayor Rudy Giuliani was photographed Friday schmoozing at Versailles. Giuliani was in town and in Boca Raton stumping for Mitt Romney.

Jamie Foxx hung out at the SLS Hotel South Beach: On Saturday he had dinner with friends in Katsuya’s Dragon Lounge. Foxx returned Sunday with a group and drank pricey Ace of Spades champagne.

Reed Alexander from Disney’s iCarly spent Saturday at the Miami Children’s Museum as part of Michelle Obama’s Let’s Move program celebrating the Summer Olympics and MCM’s exhibit, MiChiMu’s Summer Games.

Eva Longoria and ex-boyfriend and Penelope’s brother Eduardo Cruz had what was described by spy witnesses as an “ice cold” lunch Friday at Zuma. Their meal, we’re told, was very private, very brief and the antithesis of “a fiery romance setting.” Brrrr.