Emmy-nominated powerhouse television producer turned Nickelodeon president Brian Robbins and his wife Tracy James are on the move once again, this time packing their designer bags and migrating from historic Hancock Park to the glitzy awesomeness of Beverly Hills. The couple have forked out a very A-list $16.8 million — the most paid for a house in the city thus far this year — for a ravishingly louche showpiece of a modern mansion in the Trousdale Estates enclave of town.