Vanderpump Rules vets Lala Kent and Brittany Cartwright are experiencing all aspects of pregnancy together. On Thursday the tight knit friends showed off their baby bumps in Los Angeles after getting a joint in-home 4D ultrasound experience at Brittany's home. ': Brittany Cartwright, 32, and Lala Kent, 31, flash their very pregnant bellies after a joint in-home ultrasound experience in …