Mel Gibson and wife Robyn are building on attempts to help with ex-neighbor Britney Spears' personal rehabilitation with a getaway to their Costa Rica pad, People reports. The group, also including Brit's dad, jetted there yesterday "for a few days to relax." Gibson and Spears have met up previously for meals; a source tells TMZ.com the Gibsons are on a mission "to help stabilize her insane life." (More Britney Spears stories.)