Robert Downey Jr. and Wife Welcome Baby Boy

(NewsCore) - Robert Downey, Jr. and his wife Susan have welcomed their first child together.

The couple -- who married in 2005 -- celebrated the birth of their son Exton Elias early Tuesday morning in Los Angeles.

"Everyone is healthy and they couldn't be happier," a friend of the Downeys told People magazine.

Baby Exton weighed in at 7 lbs., 5 oz. (3.3kg), and is 20 inches (50.8cm) long.

The "Sherlock Holmes" star announced his wife, 38, was pregnant in August but struggled to keep the baby's gender a secret during an appearance on "The Tonight Show with Jay Leno" in December.

"I am not permitted to discuss it," the 46-year-old actor told Leno about revealing the child's sex, "I can't say a word -- We're having a boy!"

The Oscar nominee also has an 18-year-old son, Indio, with his first wife, actress/musician Deborah Falconer. They were married from 1992 to 2004.