Lorenzo Lamas, 43, and his wife, former Playboy playmate Shauna Sand, 29, are celebrating the arrival of their third daughter, Isabella Lorenza Lamas, who was born Friday, announced the couple’s publicist. Isabella weighed in at 6-pounds, 1-ounce. “Mother, father and child are doing well,” publicist Kevin Sasaki said Monday. “He’s a happy dad.” The couple have two other daughters — Alexandra, 3, and Victoria, 2. Lamas, who has starred in the TV shows “Renegade,” “Falcon Crest” and “The Immortal,” also has three children from previous marriages.