Ellen Pompeo, Chris Ivery Ellen Pompeo, Chris Ivery

Ellen Pompeo revealed she and husband Chris Ivery have welcomed a second child together on Thursday.

"Sienna May Ivery welcome to the world," the Grey's Anatomy star captioned the black-and-white photo of her husband kissing their new daughter. "We love you more than words can say."

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The couple, who used a surrogate, are already parents to Stella Luna, 5.

Pompeo, 44, later revealed on Thursday's Jimmy Kimmel Live that Sienna was born two months ago and that she felt "an obligation to keep the surrogate's privacy."