Melissa Joan Hart expecting third child

NEW YORK, NY - MARCH 19: Actress Melissa Joan Hart attends the 2012 ABC Family Upfront at the Mandarin Oriental Hotel on March 19, 2012 in New York City. (Photo by Jason Kempin/Getty Images)
Jason Kempin
Melissa Joan Hart poses with husband Mark Wilkerson and sons Mason and Braydon in a photo posted on her Twitter account on April 17, 2012.
Personal photo

(CBS News) Melissa Joan Hart had some big birthday news to share.

The actress, who turns 36 on Wednesday, announced she and husband Mark Wilkerson are expecting their third child.

Pictures: Celebrity baby bumps

Hart, who starred on "Clarissa Explains It All," "Sabrina, the Teenage Witch" and now ABC Family's "Melissa & Joey," revealed the news via Twitter on Tuesday, along with a photo of her family.

"(Early) Happy Birthday to me! And baby makes 3!" the message said.

The new arrival will join the couple's two sons, Mason, 6, and Braydon, 4.

"Melissa & Joey" returns for its second season on May 30 at 8 p.m. EDT.