VIDEO : Tori Spelling & Dean McDermott Are Sizing Down!!

Tori Spelling and Dean McDermott are downsizing big-time -- moving into a new house that's nearly half the size of their old place. The couples' new Calabasas pad is 3,733 sq. ft. and has 5 beds and 5 baths -- nothing to turn your nose up at, but since their previous home was 6,623 sq. ft. ... this might hurt a bit. They're renting this place, which has a yard, a pool, and a library -- and we're told the previous tenants dropped about $7k per month on it. On a positive note: their rent keeps going down.