On Thursday night, Federline, 28, Spears, 24, their 10-month-old son, Sean Preston, and seven friends hit the Sin City restaurant Tao at the Venetian, where Mom and Dad dined on Buddha Chicken and Kobe Sirloin and baby Sean enjoyed mashed carrots, spinach and asparagus prepared just for him by head chef Josh Thomsen, a source tells PEOPLE.
On Saturday, Federline, who will perform "Lose Control" at the Teen Choice Awards on Aug. 20, filmed the video for the song at Pure Nightclub at Caesars Palace.
Once the video had wrapped at around 10:30 p.m., Pure opened to clubgoers and Federline and his crew stayed to celebrate. Spears, who is expecting the couple's second child this fall, stopped by shortly after midnight and received a hug and plenty of attention from her husband, an observer tells PEOPLE.
