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And baby makes six!

Neal McDonough and his wife Ruvé welcomed their fourth child, daughter Clover Elizabeth, on Monday in Los Angeles, the actor tells PEOPLE.

"Ruvé gave birth to a beauty! 8½ lbs. and 21 inches with thick dark hair like her gorgeous Mommy," the Captain America: The First Avenger star, 45, says. "Ruvé is recovering well – we are so blessed."

Clover joins elder siblings London Jane, 19 months, Catherine Maggie, 4, and Morgan Patrick, 5½, who "went crazy" for their newest sister.

"London hugged and kissed her saying, 'Baby ... mine!'" McDonough tells PEOPLE.

Son Morgan suggested the baby's name, which was inspired by the four-leaf clover. "It has four leaves and this is our fourth child. Clover signifies good luck – I'm Irish and Ruvé's favorite color is green," the actor explains.

Clover was born at Good Samaritan Hospital, where McDonough serves as celebrity chairperson. "It's a wonderful, amazing hospital," he says. "All of our children have been born there."