Melissa Joan Hart pregnant with third child Melissa Joan Hart and family arrive for the "The Smurfs" in 3D Premiere at the Ziegfeld Theater in New York on July 24, 2011. LOS ANGELES, April 18 (UPI) -- U.S. actress Melissa Joan Hart celebrated her 36th birthday Wednesday by announcing she is pregnant with her third child. (Early) Happy Birthday to me! And baby makes 3!" she said via Twitter Tuesday. She and musician Mark Wilkerson married in 2003. They are already parents to sons Braydon Hart, 4, and Mason Walter, 6. No word on the baby's gender or due date. Hart is best known for her work on TV's "Melissa & Joey," "Clarissa Explains It All" and "Sabrina, the Teenage Witch."