Singer Lachey and his wife named their son Camden John Lachey. The couple said in a statement to People.com: "We are incredibly proud to announce the birth of our beautiful baby boy, Camden John Lachey. Born today at 6:54 p.m., he came into this world at 8 lbs., 9 oz. and 21 inches. Love has truly been redefined for both of us."
Lachey's ex-wife Jessica Simpson is also a new mom. She and her fiance Eric Johnson welcomed daughter Maxwell in May.
Victoria's Secret model Lima gave birth to Sienna in New York City, her second child with husband Marko Jaric. She posted on Twitter: "Marko and I are overjoyed to welcome Sienna into our family and Valentina is looking forward to becoming a big sister!"
Lima and former NBA star Jaric wed in 2009. She gave birth to her first child in November of the same year.