Mel is one friendly neighbor! Britney Spears, fresh from a media circus surrounding her most recent fender bender, hopped a plane after accepting an invite to Costa Rica from former neighbor Mel Gibson, reports People magazine . The odd couple, first spotted together having dinner in Studio City back in March, is traveling with Brit's conservator Papa Spears and Mel's wife Robin to the Gibsons' hideaway, where they'll vacation until next week. "They're just going away for a few days to relax," says ...