Oliver Hudson -- Goldie Hawn's son and Kate Hudson's brother-- debuted his daughter Rio Laura via Twitter on Friday, Aug. 16 Credit: tholiverhudson/ Twitter

Oliver Hudson is one proud dad! The 36-year-old actor introduced his daughter Rio Laura for the very first time via Twitter on Friday, Aug. 16.

"My baby girl…Rio Laura Hudson," the former Rules of Engagement actor captioned the photograph. Wearing a yellow polka dot top, the 4-week-old baby glanced away from the camera while lying on an owl blanket.

Hudson and his wife Erinn Bartlett -- married since June 2006 -- never officially confirmed the pregnancy, and the birth announcement was first made by Goldie Hawn in July.

"Welcome Rio! Our first baby girl to join our family," the proud grandma tweeted at the time. "Oliver and Erinn thank you for bringing so much JOY to our lives! #happiness."

Rio Laura joins big brothers Bodhi, 3, and Wilder, 5 1/2. She also joins Kate Hudson's kids, cousins Ryder, 9, and Bingham, 2.