Pretty Little Liars' Tammin Sursok Pregnant

There will soon be another pretty little liar in the family.

Tammin Sursok, who portrays Jenna on Pretty Little Liars, announced on Twitter Thursday that she's pregnant with her first child.

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"And the[n] THIS happened #pll #positive #baby #pregnant" Sursok tweeted along with a photo of her positive pregnancy test. "Finally! Don't worry. Still shooting #pll. I wouldn't let you down!"

This is the first baby for Sursok, 29, and husband Sean McEwen, who wed back in 2011.