Nathan West and Chyler Leigh Nathan West and Chyler Leigh

Grey's Anatomy star Chyler Leigh has given birth to her third child, daughter named Anniston Kae.

Leigh and her husband, actor Nathan West, welcomed the new arrival on Thursday — the night of Grey's milestone 100th episode, and a week after production on the ABC serial wrapped for the season.

"Both mother and child are healthy," Leigh's rep tells People. The actress' pregnancy had not been written into her Grey's storyline.

Baby Anniston, who tipped the scales at 7 pounds and 1 ounce, joins siblings Noah, 5, and Taelyn, 2.

Leigh, 27, and West, 30, have been married since 2002.

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