Here are some photos of Amanda Aardsma (born:October 24, 1982 Denver, Colorado, USA) as the new Mackenzie Browning on The Young and the Restless. She's the younger sister of the baseball player David Aardsma. Here are some photos of Amanda Aardsma (born:October 24, 1982 Denver, Colorado, USA) as the new Mackenzie Browning on The Young and the Restless. She's the younger sister of the baseball player David Aardsma.