Tina Campbell, half of the multi-Grammy Award-winning sister duo, Mary Mary, has just announced that she and husband, Teddy Campbell are expecting. The proud and devoted parents of four children are thrilled to welcome a new addition to their family. Tina’s announcement comes on the heels of sister and duo mate Erica and husband Warryn Campbell’s arrival of their new baby girl Zaya Monique. The sisters Campbell are no strangers to delivering their children in close proximity to each other. In years’past, both couples have had children within months of the other. The news also arrives in the midst of…