When not grabbing a bite with beau and Latin crooner Luis Miguel, Brittny Gastineau loves to hit the shops in Beverly Hills with her sexy mom Lisa.

The two ladies enjoyed some retail therapy near Rodeo. Brittny, who has her own jewerly line Tres Glam, knows a thing or two about fashion ... considering she's Kim Kardashian's longtime BFF.

Looks like the Gastineau girls are helping to keep our economy in check!