Blood, as they say, is thicker than water. But on Tuesday night, the Australian family called Watts took the old adage to a whole new level. For actress Naomi and her brother, Ben Watts, a fashion and celebrity photographer, blood is even thicker than the possibility of water breaking. The very pregnant star of Mulholland Drive and King Kong hosted a dinner with MAC Cosmetics in honor of her shutterbug sibling on the top floor of Milk Studios—his work was on display at Milk Gallery several floors below. "It'd be all right if she went into labor," joked Ben. "This is just a casual family dinner." If black candelabras, three courses, and a guest list that included Kelly Klein, Damon Dash, David Schwimmer, Maxwell, Angela Lindvall, and Sean Avery are casual, imagine what Ben calls formal. Even his sister was impressed. "I'm staying later than planned," said Liev Schreiber's better half. "Who would've thought my brother was so sophisticated?"

— Derek Blasberg