Jeff Nelson / People: Meghan Trainor and Daryl Sabara Welcome Third Baby, a Daughter, Via 'Superwoman Surrogate': 'Safest Way' to Grow Our Family - The "Still Don't Care" singer and the 'Spy Kids' actor are already parents to sons Riley, 4, and Barry, 2 - Meghan Trainor and her husband Daryl Sabara have welcomed third child together