Parenthood got off to a bumpy start for Jason Priestley and wife Naomi Lowde-Priestley. Four days after the July 2 birth of their 7-pound, 4-ounce daughter Ava, the couple left L.A.'s Cedars-Sinai Medical Center and brought their brand new bundle of joy home. Once night fell, however, Ava "cried all night," Priestley tells Us Weekly in this week's cover story. "We came home from the hospital and were like, 'Is this what it is like?'" Luckily for the Priestleys, Ava has adjusted wonderfully to her new home and the first-time parents couldn't be happier. "She is very mellow," Naomi gushes. It helps that Priestley, 37, has gone from 90210 to Nanny 911! "You gotta be involved," says Priestley, whom his wife, 31, describes as a "very hands-on" dad. "The other day I had her on my chest and she peed on me. But babies are like bunny rabbits. When they pee on you, it means they like you." Priestley adds, "The first time I saw her, time stood still. It took my breath away."