Tori Spelling and Dean McDermott Tori Spelling and Dean McDermott

Tori Spelling is pregnant with her third child, TVGuide.com has confirmed.

The 37-year-old 90210 alum took to Twitter to announce the big news. "I know there's been a lot of speculation, so I wanted everyone to hear from me... Its official...Dean & I are PREGNANT!!!!" she wrote.

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Spelling and husband Dean McDermott, 44, are parents to Liam 4, and Stella, 2. McDermott also has a 12-year-old son from a previous marriage.

The couple, who wed in 2006, currently star in Oxygen's Tori & Dean: sTORIbookWeddings.