It's a Boy for Tamera Mowry!

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The former star of Sister Sister is now a mother for the first time.

Tamera Mowry and husband Adam Housely welcomed a son named Aden John Tanner into the world Monday, sources confirm to Us Weekly. The little one weighed in at nine pounds, five ounces.

Tamera Mowry Pic

Mowry's equally famous sibling, Tia, is also the proud mother of a young son: Cree was born June 28, 2011.

"When my sister was pregnant, she told me everything that I needed to know about pregnancy," Tamera joked last year, adding that Tia's TMI stories actually encouraged her NOT to get knocked up.

But it's too late for that! We send our best wishes to Mowry and Housley (a Fox News correspondent), who got married in May of 2011.